Sports Spread Betting companies and firm reviews including Extrabet, Sporting Index and SpreadEx.
Here is a short Extrabet review whilst you're doing your research. Extrabet were formerly known as IG Sport, and are still part of the IG group...
Sporting Index are the only dedicated sports spread betting firm in the UK. They claim 70% of the market share in the field
Spreadex are a sports and financials spread betting company, based in St. Albans.