diff --git a/Code/Mantid/instrument/CNCS_Definition.xml b/Code/Mantid/instrument/CNCS_Definition.xml
index d7d166cebba1..e4071849d7b9 100644
--- a/Code/Mantid/instrument/CNCS_Definition.xml
+++ b/Code/Mantid/instrument/CNCS_Definition.xml
@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='ASCII'?>
-<instrument valid-to="2100-01-31 23:59:59" name="CNCS" valid-from="2012-02-15 10:45:00">
-  <!--for runs after 44930 -->
+<instrument valid-to="2100-01-31 23:59:59" name="CNCS" valid-from="2012-04-26 22:10:01">
+  <!--for runs 51071 onwards -->
   <defaults>
     <length unit="metre"/>
     <angle unit="degree"/>
@@ -187,351 +187,351 @@
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diff --git a/Code/Mantid/instrument/CNCS_Definition_upto_35154.xml b/Code/Mantid/instrument/CNCS_Definition_1-35154.xml
similarity index 100%
rename from Code/Mantid/instrument/CNCS_Definition_upto_35154.xml
rename to Code/Mantid/instrument/CNCS_Definition_1-35154.xml
diff --git a/Code/Mantid/instrument/CNCS_Definition_35154-44929.xml b/Code/Mantid/instrument/CNCS_Definition_35155-44929.xml
similarity index 100%
rename from Code/Mantid/instrument/CNCS_Definition_35154-44929.xml
rename to Code/Mantid/instrument/CNCS_Definition_35155-44929.xml
diff --git a/Code/Mantid/instrument/CNCS_Definition_44930-51070.xml b/Code/Mantid/instrument/CNCS_Definition_44930-51070.xml
new file mode 100644
index 000000000000..043bc769fe15
--- /dev/null
+++ b/Code/Mantid/instrument/CNCS_Definition_44930-51070.xml
@@ -0,0 +1,729 @@
+<?xml version='1.0' encoding='ASCII'?>
+<instrument valid-to="2012-04-26 22:10:00" name="CNCS" valid-from="2012-02-15 10:45:00">
+  <!--for runs 44930 to 51070-->
+  <defaults>
+    <length unit="metre"/>
+    <angle unit="degree"/>
+    <reference-frame>
+      <along-beam axis="z"/>
+      <pointing-up axis="y"/>
+      <handedness axis="right"/>
+    </reference-frame>
+  </defaults>
+  <!--SOURCE AND SAMPLE POSITION-->
+  <component type="moderator">
+    <location z="-36.262"/>
+  </component>
+  <type is="Source" name="moderator"/>
+  <component type="sample-position">
+    <location y="0.0" x="0.0" z="0.0"/>
+  </component>
+  <type is="SamplePos" name="sample-position"/>
+  <!--MONITORS-->
+  <component type="monitors" idlist="monitors">
+    <location/>
+  </component>
+  <type name="monitors">
+    <component mark-as="monitor" type="monitor">
+      <location z="-29.949" name="monitor1"/>
+      <location z="-28.706" name="monitor2"/>
+      <location z="-1.426" name="monitor3"/>
+    </component>
+  </type>
+  <component type="detectors" idlist="detectors">
+    <location/>
+  </component>
+  <type name="detectors">
+    <component type="bank1">
+      <location/>
+    </component>
+    <component type="bank2">
+      <location/>
+    </component>
+    <component type="bank3">
+      <location/>
+    </component>
+    <component type="bank4">
+      <location/>
+    </component>
+    <component type="bank5">
+      <location/>
+    </component>
+    <component type="bank6">
+      <location/>
+    </component>
+    <component type="bank7">
+      <location/>
+    </component>
+    <component type="bank8">
+      <location/>
+    </component>
+    <component type="bank9">
+      <location/>
+    </component>
+    <component type="bank10">
+      <location/>
+    </component>
+    <component type="bank11">
+      <location/>
+    </component>
+    <component type="bank12">
+      <location/>
+    </component>
+    <component type="bank13">
+      <location/>
+    </component>
+    <component type="bank14">
+      <location/>
+    </component>
+    <component type="bank15">
+      <location/>
+    </component>
+    <component type="bank16">
+      <location/>
+    </component>
+    <component type="bank17">
+      <location/>
+    </component>
+    <component type="bank18">
+      <location/>
+    </component>
+    <component type="bank19">
+      <location/>
+    </component>
+    <component type="bank20">
+      <location/>
+    </component>
+    <component type="bank21">
+      <location/>
+    </component>
+    <component type="bank22">
+      <location/>
+    </component>
+    <component type="bank23">
+      <location/>
+    </component>
+    <component type="bank24">
+      <location/>
+    </component>
+    <component type="bank25">
+      <location/>
+    </component>
+    <component type="bank26">
+      <location/>
+    </component>
+    <component type="bank27">
+      <location/>
+    </component>
+    <component type="bank28">
+      <location/>
+    </component>
+    <component type="bank29">
+      <location/>
+    </component>
+    <component type="bank30">
+      <location/>
+    </component>
+    <component type="bank31">
+      <location/>
+    </component>
+    <component type="bank32">
+      <location/>
+    </component>
+    <component type="bank33">
+      <location/>
+    </component>
+    <component type="bank34">
+      <location/>
+    </component>
+    <component type="bank35">
+      <location/>
+    </component>
+    <component type="bank36">
+      <location/>
+    </component>
+    <component type="bank37">
+      <location/>
+    </component>
+    <component type="bank38">
+      <location/>
+    </component>
+    <component type="bank39">
+      <location/>
+    </component>
+    <component type="bank40">
+      <location/>
+    </component>
+    <component type="bank41">
+      <location/>
+    </component>
+    <component type="bank42">
+      <location/>
+    </component>
+    <component type="bank43">
+      <location/>
+    </component>
+    <component type="bank44">
+      <location/>
+    </component>
+    <component type="bank45">
+      <location/>
+    </component>
+    <component type="bank46">
+      <location/>
+    </component>
+    <component type="bank47">
+      <location/>
+    </component>
+    <component type="bank48">
+      <location/>
+    </component>
+    <component type="bank49">
+      <location/>
+    </component>
+    <component type="bank50">
+      <location/>
+    </component>
+  </type>
+  <type name="bank1">
+    <component type="eightpack">
+      <location y="0.0" x="2.64515" z="-2.30223">
+        <rot axis-z="0" axis-x="0" axis-y="1" val="311.035"/>
+      </location>
+    </component>
+  </type>
+  <type name="bank2">
+    <component type="eightpack">
+      <location y="0.0" x="2.78336" z="-2.13151">
+        <rot axis-z="0" axis-x="0" axis-y="1" val="307.445"/>
+      </location>
+    </component>
+  </type>
+  <type name="bank3">
+    <component type="eightpack">
+      <location y="0.0" x="2.91098" z="-1.95278">
+        <rot axis-z="0" axis-x="0" axis-y="1" val="303.855"/>
+      </location>
+    </component>
+  </type>
+  <type name="bank4">
+    <component type="eightpack">
+      <location y="0.0" x="3.0272" z="-1.76648">
+        <rot axis-z="0" axis-x="0" axis-y="1" val="300.265"/>
+      </location>
+    </component>
+  </type>
+  <type name="bank5">
+    <component type="eightpack">
+      <location y="0.0" x="3.12811" z="-1.57157">
+        <rot axis-z="0" axis-x="0" axis-y="1" val="296.675"/>
+      </location>
+    </component>
+  </type>
+  <type name="bank6">
+    <component type="eightpack">
+      <location y="0.0" x="3.21668" z="-1.37104">
+        <rot axis-z="0" axis-x="0" axis-y="1" val="293.085"/>
+      </location>
+    </component>
+  </type>
+  <type name="bank7">
+    <component type="eightpack">
+      <location y="0.0" x="3.29461" z="-1.16636">
+        <rot axis-z="0" axis-x="0" axis-y="1" val="289.495"/>
+      </location>
+    </component>
+  </type>
+  <type name="bank8">
+    <component type="eightpack">
+      <location y="0.0" x="3.36231" z="-0.958096">
+        <rot axis-z="0" axis-x="0" axis-y="1" val="285.905"/>
+      </location>
+    </component>
+  </type>
+  <type name="bank9">
+    <component type="eightpack">
+      <location y="0.0" x="3.41676" z="-0.745912">
+        <rot axis-z="0" axis-x="0" axis-y="1" val="282.315"/>
+      </location>
+    </component>
+  </type>
+  <type name="bank10">
+    <component type="eightpack">
+      <location y="0.0" x="3.45357" z="-0.530013">
+        <rot axis-z="0" axis-x="0" axis-y="1" val="278.725"/>
+      </location>
+    </component>
+  </type>
+  <type name="bank11">
+    <component type="eightpack">
+      <location y="0.0" x="3.4813" z="-0.312841">
+        <rot axis-z="0" axis-x="0" axis-y="1" val="275.135"/>
+      </location>
+    </component>
+  </type>
+  <type name="bank12">
+    <component type="eightpack">
+      <location y="0.0" x="3.50096" z="-0.0944275">
+        <rot axis-z="0" axis-x="0" axis-y="1" val="271.545"/>
+      </location>
+    </component>
+  </type>
+  <type name="bank13">
+    <component type="eightpack">
+      <location y="0.0" x="3.50015" z="0.12498">
+        <rot axis-z="0" axis-x="0" axis-y="1" val="267.955"/>
+      </location>
+    </component>
+  </type>
+  <type name="bank14">
+    <component type="eightpack">
+      <location y="0.0" x="3.48616" z="0.343971">
+        <rot axis-z="0" axis-x="0" axis-y="1" val="264.365"/>
+      </location>
+    </component>
+  </type>
+  <type name="bank15">
+    <component type="eightpack">
+      <location y="0.0" x="3.45456" z="0.561063">
+        <rot axis-z="0" axis-x="0" axis-y="1" val="260.775"/>
+      </location>
+    </component>
+  </type>
+  <type name="bank16">
+    <component type="eightpack">
+      <location y="0.0" x="3.41221" z="0.776174">
+        <rot axis-z="0" axis-x="0" axis-y="1" val="257.185"/>
+      </location>
+    </component>
+  </type>
+  <type name="bank17">
+    <component type="eightpack">
+      <location y="0.0" x="3.35588" z="0.988008">
+        <rot axis-z="0" axis-x="0" axis-y="1" val="253.595"/>
+      </location>
+    </component>
+  </type>
+  <type name="bank18">
+    <component type="eightpack">
+      <location y="0.0" x="3.29067" z="1.19738">
+        <rot axis-z="0" axis-x="0" axis-y="1" val="250.005"/>
+      </location>
+    </component>
+  </type>
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+    <component type="eightpack">
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+        <rot axis-z="0" axis-x="0" axis-y="1" val="246.415"/>
+      </location>
+    </component>
+  </type>
+  <type name="bank20">
+    <component type="eightpack">
+      <location y="0.0" x="3.10844" z="1.59581">
+        <rot axis-z="0" axis-x="0" axis-y="1" val="242.825"/>
+      </location>
+    </component>
+  </type>
+  <type name="bank21">
+    <component type="eightpack">
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+        <rot axis-z="0" axis-x="0" axis-y="1" val="239.235"/>
+      </location>
+    </component>
+  </type>
+  <type name="bank22">
+    <component type="eightpack">
+      <location y="0.0" x="2.88472" z="1.97188">
+        <rot axis-z="0" axis-x="0" axis-y="1" val="235.645"/>
+      </location>
+    </component>
+  </type>
+  <type name="bank23">
+    <component type="eightpack">
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+      </location>
+    </component>
+  </type>
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+    <component type="eightpack">
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+      </location>
+    </component>
+  </type>
+  <type name="bank25">
+    <component type="eightpack">
+      <location y="0.0" x="2.46434" z="2.47511">
+        <rot axis-z="0" axis-x="0" axis-y="1" val="224.875"/>
+      </location>
+    </component>
+  </type>
+  <type name="bank26">
+    <component type="eightpack">
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+  </type>
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+  </type>
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+      <location y="0.0234375" name="pixel66"/>
+      <location y="0.0390625" name="pixel67"/>
+      <location y="0.0546875" name="pixel68"/>
+      <location y="0.0703125" name="pixel69"/>
+      <location y="0.0859375" name="pixel70"/>
+      <location y="0.1015625" name="pixel71"/>
+      <location y="0.1171875" name="pixel72"/>
+      <location y="0.1328125" name="pixel73"/>
+      <location y="0.1484375" name="pixel74"/>
+      <location y="0.1640625" name="pixel75"/>
+      <location y="0.1796875" name="pixel76"/>
+      <location y="0.1953125" name="pixel77"/>
+      <location y="0.2109375" name="pixel78"/>
+      <location y="0.2265625" name="pixel79"/>
+      <location y="0.2421875" name="pixel80"/>
+      <location y="0.2578125" name="pixel81"/>
+      <location y="0.2734375" name="pixel82"/>
+      <location y="0.2890625" name="pixel83"/>
+      <location y="0.3046875" name="pixel84"/>
+      <location y="0.3203125" name="pixel85"/>
+      <location y="0.3359375" name="pixel86"/>
+      <location y="0.3515625" name="pixel87"/>
+      <location y="0.3671875" name="pixel88"/>
+      <location y="0.3828125" name="pixel89"/>
+      <location y="0.3984375" name="pixel90"/>
+      <location y="0.4140625" name="pixel91"/>
+      <location y="0.4296875" name="pixel92"/>
+      <location y="0.4453125" name="pixel93"/>
+      <location y="0.4609375" name="pixel94"/>
+      <location y="0.4765625" name="pixel95"/>
+      <location y="0.4921875" name="pixel96"/>
+      <location y="0.5078125" name="pixel97"/>
+      <location y="0.5234375" name="pixel98"/>
+      <location y="0.5390625" name="pixel99"/>
+      <location y="0.5546875" name="pixel100"/>
+      <location y="0.5703125" name="pixel101"/>
+      <location y="0.5859375" name="pixel102"/>
+      <location y="0.6015625" name="pixel103"/>
+      <location y="0.6171875" name="pixel104"/>
+      <location y="0.6328125" name="pixel105"/>
+      <location y="0.6484375" name="pixel106"/>
+      <location y="0.6640625" name="pixel107"/>
+      <location y="0.6796875" name="pixel108"/>
+      <location y="0.6953125" name="pixel109"/>
+      <location y="0.7109375" name="pixel110"/>
+      <location y="0.7265625" name="pixel111"/>
+      <location y="0.7421875" name="pixel112"/>
+      <location y="0.7578125" name="pixel113"/>
+      <location y="0.7734375" name="pixel114"/>
+      <location y="0.7890625" name="pixel115"/>
+      <location y="0.8046875" name="pixel116"/>
+      <location y="0.8203125" name="pixel117"/>
+      <location y="0.8359375" name="pixel118"/>
+      <location y="0.8515625" name="pixel119"/>
+      <location y="0.8671875" name="pixel120"/>
+      <location y="0.8828125" name="pixel121"/>
+      <location y="0.8984375" name="pixel122"/>
+      <location y="0.9140625" name="pixel123"/>
+      <location y="0.9296875" name="pixel124"/>
+      <location y="0.9453125" name="pixel125"/>
+      <location y="0.9609375" name="pixel126"/>
+      <location y="0.9765625" name="pixel127"/>
+      <location y="0.9921875" name="pixel128"/>
+    </component>
+  </type>
+  <!--PIXEL FOR STANDARD 2m 128 PIXEL TUBE-->
+  <type is="detector" name="pixel">
+    <cylinder id="cyl-approx">
+      <centre-of-bottom-base p="0.0" r="0.0" t="0.0"/>
+      <axis y="1.0" x="0.0" z="0.0"/>
+      <radius val="0.0127"/>
+      <height val="0.015625"/>
+    </cylinder>
+    <algebra val="cyl-approx"/>
+  </type>
+  <!--MONITOR SHAPE-->
+  <!--FIXME: Do something real here.-->
+  <type is="detector" name="monitor">
+    <cylinder id="cyl-approx">
+      <centre-of-bottom-base y="0.0" x="0.0" z="0.0"/>
+      <axis y="0.0" x="0.0" z="1.0"/>
+      <radius radius="0.01"/>
+      <height height="0.03"/>
+    </cylinder>
+    <algebra val="cyl-approx"/>
+  </type>
+  <!--DETECTOR IDs-->
+  <idlist idname="detectors">
+    <id start="0" end="51199"/>
+  </idlist>
+  <!--MONITOR IDs-->
+  <idlist idname="monitors">
+    <id val="-1"/>
+    <id val="-2"/>
+    <id val="-3"/>
+  </idlist>
+  <!--DETECTOR PARAMETERS-->
+  <component-link name="detectors">
+    <parameter name="tube_pressure">
+      <value units="atm" val="6.0"/>
+    </parameter>
+    <parameter name="tube_thickness">
+      <value units="metre" val="0.0008"/>
+    </parameter>
+    <parameter name="tube_temperature">
+      <value units="K" val="290.0"/>
+    </parameter>
+  </component-link>
+</instrument>