Hey Guys,
I have been collecting sports cards since 1967, and started with soccer in the early 1990s. Here are 2 sites that may assist you:
http://cards.littleoak.com.au
www.soccercardindex.com
The Australian site is run by a collector named Nigel Mercer and it covers all (or nearly all) English and Scottish issues from 1965 - 1980. There are photos of most of the cards, complete checklists, card wrappers, boxes, stories, etc.
Soccer card index is maintained by a Norwegian collector and has many , many checklists of newer issues from all over the world. He has recently added 3 1970s Topps English sets from Nigel's site, and is always updating with new sets from the UK, Spain, Germany, etc.
I hope this helps, as I am also constantly looking for more soccer card info.
Jeff