saxtwd: Welcome to the CCF!
See if you can get a copy of:
'Coincraft's 1998 Standard Catalogue of English and UK Coins 1066 to Date'
I know it's a bit out of date, but it is a bit like a Krause telephone book, only with hard covers. It has a wealth of collecting advice for each type of coin.
The only problem with it now, is that the prices are out of date. Not really a worry, current prices can be found elsewhere on the Net.
I would inquire firstly about sourcing this book from an American dealer, or from
ebay, (not much problem with fakes here!), then maybe from Brit. dealers.
Spink's or Seaby's in London may help. They have helped me with impossible to obtain references in the past.
Question: Would CCF'ers be able to advise him on references re coins minted before 1066?