Betfair

The Market leader. No other site comes close in rspect of liquidity or speed of access. The commission rate is 5% and can be reduced according to a sliding scale depending on how much one turns over with them.

Betdaq

Liquidity is not as good as Betfair but commission is less.

Internet Betting

Description: Online Sportsbook and Online Casino Jazz Sports provides Live Odds Sports News Free Live Odds Sports Betting and Gambling Odds Online at JazzSports.com

UK Horse Racing advice

Get free-value advice on betting exchanges. Your link at http://www.free-value.co.uk/latest_links.html

BCS

BCS