In the 1960's there were 85 folk making balls in Tonbridge alone, but there was already mention of cheaper balls made in Pakistan and India, I love this 1960's article from the Kent messenger especially the union reps title.
Here are a few interesting links I found, the ballmakers union which "upped stumps and headed for the pavilion" in 2006 http://www.unionancestors.co.uk/Cricketballmakers.htm
Nice page on Tonbridge ball making http://tonbridgecollectables.com/page5.php
So we will be following up the glorious English game with the ECB and hoping that we don't find the sort of story of child labour that was highlighted with footballs a few years ago. If anyone can find us info on any UK made cricket balls I would be pleased to hear and we will give the makers a good plug.