Golden Palace Poker is one of the ones on that list–it’s available to promote through Casinoblasters. Same with Aspinalls Poker. Victor Chandler’s poker product is available through the Victor Chandler affiliate program.
My guess is that many of the others are private label through one source another, possibly PokerBlasters, but there might be other routes to getting private-labeled with them besides that program. I’m relatively sure that Doyles Room is a private label, but I’m not sure through whom.
I’ve played the software there. Nothing extraordinary, but it’s allright. I make a little money with Golden Palace Poker each month, but nothing extraordinary. I think Ultimate Bet and Absolute Poker have got their software beat hands down in terms of being a “robust” software, and Party Poker just plain has tremendous amounts of action.
I’ve read that the online poker market in England is wide open and not nearly as saturated as the USA market. Apsinalls or Victor Chandler might be excellent options to promote to English players because of that.