diff --git a/.golangci.yml b/.golangci.yml
index bd81d919b..a046a3fcb 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -8,7 +8,7 @@ linters-settings:
     default-signifies-exhaustive: true
   forbidigo:
     forbid:
-      - 'fmt\.Print.*'            # Prevent debug logging
+      - 'fmt\.Print.*(# Avoid debug logging)?'
   gci:
     local-prefixes: github.com/obolnetwork/charon
   gocritic:
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 8478d957a..331c2e94b 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -59,3 +59,9 @@ repos:
         language: script
         entry: .pre-commit/run_buf.sh
         types: [ file, proto ]
+      - id: run-regexp
+        name: run-regexp
+        language: script
+        entry: .pre-commit/run_regexp.sh
+        types: [ file, go ]
+        exclude: "_test.go"
diff --git a/.pre-commit/run_regexp.sh b/.pre-commit/run_regexp.sh
new file mode 100755
index 000000000..e30d808dd
--- /dev/null
+++ b/.pre-commit/run_regexp.sh
@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+FILES=$@
+
+function check() {
+    grep -HnE "$2" $FILES && printf "\n❌ Regexp check failed: %s\n\n" "$1"
+}
+
+check 'Log messages must be capitalised' 'log\.(Error|Warn|Info|Debug)\(ctx, "[[:lower:]]' && exit 1
+check 'Error messages must not be capitalised' 'errors\.(New|Wrap)\((err, )?"[[:upper:]]' && exit 1
+
+true
diff --git a/cmd/enr.go b/cmd/enr.go
index fb34c767e..8ff46dd70 100644
--- a/cmd/enr.go
+++ b/cmd/enr.go
@@ -53,7 +53,7 @@ func newEnrCmd(runFunc func(io.Writer, p2p.Config, string) error) *cobra.Command
 func runNewENR(w io.Writer, config p2p.Config, dataDir string) error {
 	key, err := p2p.LoadPrivKey(dataDir)
 	if errors.Is(err, fs.ErrNotExist) {
-		return errors.New("ENR private key not found. If this is your first time running this client, create one with `charon create enr`.", z.Str("enr_path", p2p.KeyPath(dataDir))) //nolint:revive
+		return errors.New("private key not found. If this is your first time running this client, create one with `charon create enr`.", z.Str("enr_path", p2p.KeyPath(dataDir))) //nolint:revive
 	} else if err != nil {
 		return err
 	}
diff --git a/cmd/enr_internal_test.go b/cmd/enr_internal_test.go
index 3227a0a39..edd45ac61 100644
--- a/cmd/enr_internal_test.go
+++ b/cmd/enr_internal_test.go
@@ -32,6 +32,6 @@ func TestRunNewEnr(t *testing.T) {
 	require.NoError(t, err)
 
 	got := runNewENR(io.Discard, p2p.Config{}, temp)
-	expected := errors.New("ENR private key not found. If this is your first time running this client, create one with `charon create enr`.", z.Str("enr_path", p2p.KeyPath(temp)))
+	expected := errors.New("private key not found. If this is your first time running this client, create one with `charon create enr`.", z.Str("enr_path", p2p.KeyPath(temp)))
 	require.Equal(t, expected.Error(), got.Error())
 }
diff --git a/core/parsigex/parsigex.go b/core/parsigex/parsigex.go
index 677c65864..53180a7fa 100644
--- a/core/parsigex/parsigex.go
+++ b/core/parsigex/parsigex.go
@@ -66,13 +66,13 @@ func (m *ParSigEx) handle(s network.Stream) {
 
 	b, err := io.ReadAll(s)
 	if err != nil {
-		log.Error(ctx, "read proto bytes", err)
+		log.Error(ctx, "Read proto bytes", err)
 		return
 	}
 
 	var pb pbv1.ParSigExMsg
 	if err := proto.Unmarshal(b, &pb); err != nil {
-		log.Error(ctx, "unmarshal parsigex proto", err)
+		log.Error(ctx, "Unmarshal parsigex proto", err)
 		return
 	}
 
@@ -87,7 +87,7 @@ func (m *ParSigEx) handle(s network.Stream) {
 	for _, sub := range m.subs {
 		err := sub(ctx, duty, set)
 		if err != nil {
-			log.Error(ctx, "subscribe error", err)
+			log.Error(ctx, "Subscribe error", err)
 		}
 	}
 }
diff --git a/core/scheduler/scheduler.go b/core/scheduler/scheduler.go
index 9d551e5b2..c8f0abe00 100644
--- a/core/scheduler/scheduler.go
+++ b/core/scheduler/scheduler.go
@@ -519,7 +519,7 @@ func waitChainStart(ctx context.Context, eth2Cl eth2Provider, clock clockwork.Cl
 	for {
 		genesis, err := eth2Cl.GenesisTime(ctx)
 		if err != nil {
-			log.Error(ctx, "failure getting genesis time", err)
+			log.Error(ctx, "Failure getting genesis time", err)
 			clock.Sleep(time.Second * 5) // TODO(corver): Improve backoff
 
 			continue
@@ -544,7 +544,7 @@ func waitBeaconSync(ctx context.Context, eth2Cl eth2Provider, clock clockwork.Cl
 	for {
 		state, err := eth2Cl.NodeSyncing(ctx)
 		if err != nil {
-			log.Error(ctx, "failure getting sync state", err)
+			log.Error(ctx, "Failure getting sync state", err)
 			clock.Sleep(time.Second * 5) // TODO(corver): Improve backoff
 
 			continue
diff --git a/testutil/beaconmock/options.go b/testutil/beaconmock/options.go
index 44e4fe022..c13b9b667 100644
--- a/testutil/beaconmock/options.go
+++ b/testutil/beaconmock/options.go
@@ -127,7 +127,7 @@ func WithValidatorSet(set ValidatorSet) Option {
 				if ok {
 					resp[val.Index] = cloneValidator(val)
 				} else {
-					log.Debug(ctx, "pubkey not found")
+					log.Debug(ctx, "Pubkey not found")
 				}
 			}
 
@@ -141,7 +141,7 @@ func WithValidatorSet(set ValidatorSet) Option {
 				if ok {
 					resp[index] = cloneValidator(val)
 				} else {
-					log.Debug(ctx, "index not found")
+					log.Debug(ctx, "Index not found")
 				}
 			}
 
diff --git a/testutil/compose/compose/main.go b/testutil/compose/compose/main.go
index cc0c7702f..cc24dbf2f 100644
--- a/testutil/compose/compose/main.go
+++ b/testutil/compose/compose/main.go
@@ -214,7 +214,7 @@ func newAutoCmd(tmplCallback func(data *compose.TmplData)) *cobra.Command {
 			fail = true
 		}
 		if fail {
-			return errors.New("Alerts detected")
+			return errors.New("alerts detected")
 		}
 
 		return nil
@@ -236,22 +236,6 @@ func printDockerCompose(ctx context.Context, dir string) error {
 		return errors.Wrap(err, "exec cat docker-compose.yml")
 	}
 
-	return ls(ctx, dir)
-}
-
-// printDockerCompose prints the docker-compose.yml file to stdout.
-func ls(ctx context.Context, dir string) error {
-	log.Info(ctx, "ls dir")
-	cmd := exec.CommandContext(ctx, "ls", "-la")
-	cmd.Dir = dir
-	cmd.Stdout = os.Stdout
-	cmd.Stderr = os.Stderr
-
-	err := cmd.Run()
-	if err != nil {
-		return errors.Wrap(err, "exec ls")
-	}
-
 	return nil
 }
 
diff --git a/testutil/validatormock/validatormock.go b/testutil/validatormock/validatormock.go
index 3ef21b6ae..c97b721b1 100644
--- a/testutil/validatormock/validatormock.go
+++ b/testutil/validatormock/validatormock.go
@@ -372,7 +372,7 @@ func getBlock(endpoint string, base string) (io.Reader, error) {
 
 	statusFamily := res.StatusCode / 100
 	if statusFamily != 2 {
-		return nil, errors.New("GET failed", z.Int("status", res.StatusCode), z.Str("data", string(data)))
+		return nil, errors.New("get failed", z.Int("status", res.StatusCode), z.Str("data", string(data)))
 	}
 
 	return bytes.NewReader(data), nil