The project had a good day at Harpenden with 11 new cards sets and 57 revisions found!
It has now become clear why the card sets vary so much - the deal was that you got your new tester with a standard card set plus 100 cards of your choice.
We now have 88.6% of known-to-exist card sets - so still looking for 125 sets and wondering why 103 were not issued.
For those who are waiting to check their cards,
http://home.btconnect.com/gmb/mullard.htm is now updated.