For this type of thing, there is a great price list/catalogue of bits and bobs packed with good
advice from 'Hard To Find'.
The last one I have is for 2001 and states 'send 54p in stamps on an A5 envelope for an update'.
"Hard to Find" (Francis Thurmer, Unit 20 Kemps Farm, Chapel Road, Ford, Aylesbury, Bucks HP17
8XG). Tel: 01296 747377 1300-1600 Tues/Thu/Sat or mobile 07850 740591 - Francis is a mobile