demo build works

build/lib/addons/wrap.js

@@ -1,5 +1,5 @@
 // Slightly modified version of entry-wrap-webpack-plugin https://github.com/shakyShane/entry-wrap-webpack-plugin
-const ConcatSource = require('webpack-sources/lib/ConcatSource');
+const ConcatSource = require('webpack/lib/ConcatSource');
 
 function Wrap (before, after, options) {
 	this.options = options || {};

build/lib/head-css.js

@@ -1,4 +1,5 @@
 const ExtractCssBlockPlugin = require('extract-css-block-webpack-plugin');
+
 module.exports = function (config) {
 	config.plugins.push(new ExtractCssBlockPlugin());
 	return config;

demo/webpack.config.js

@@ -3,7 +3,7 @@
 const nWebpack = require('@financial-times/n-webpack');
 const headCss = require('../build/lib/head-css')
 const path = require('path');
-const webPackConfig = headCss(nWebpack({
+const webpackConfig = headCss(nWebpack({
 	withBabelPolyfills: false,
 	entry: {
 		'./public/main-without-n-ui.js': './demo/client/main.js',
@@ -15,4 +15,6 @@ const webPackConfig = headCss(nWebpack({
 	exclude: [/node_modules/]
 }));
 
+console.log(JSON.stringify(webpackConfig, null, 2))
+
 module.exports = webpackConfig;

package.json

@@ -66,7 +66,6 @@
     "@financial-times/n-express": "^19.0.0",
     "@financial-times/n-handlebars": "^1.15.0",
     "@financial-times/n-polyfill-io": "^1.0.9",
-    "@financial-times/n-webpack": "^2.0.0",
     "@financial-times/next-json-ld": "^0.1.0",
     "aws-sdk": "^2.7.21",
     "chokidar": "^1.6.1",