Full ID/etc verification is the norm for EU books, I always just provide things up-front when opening accounts to avoid the situation entirely.
UK books can palp or restate odds on a wager unless other books were same/nearly so odds for the same line. bestbetting.com can be invaluable as they will show graphs of the various books on a line over time as long as it is before the event. IBAS will force a book to pay at original odds given, if you can prove they were not massively out of line.
UK books can palp or restate odds on a wager unless other books were same/nearly so odds for the same line. bestbetting.com can be invaluable as they will show graphs of the various books on a line over time as long as it is before the event. IBAS will force a book to pay at original odds given, if you can prove they were not massively out of line.