Betfair SP - Successful Debut Betfair launched their SP product today covering the seven races at Southwell and report that the day went without a hitch.The returned SP was close to 100% for each race and a level stake on each winner would have returned a greater profit than with conventional bookmakers.Betfair have not given details of the volume of bets matched at their SP, so whether or not the prices would have stood up to bigger stakes is questionable.The Betfair SP product will be available on all UK races from tomorrow and extended to Irish horse racing in about two weeks.The percentages for each race and the winners´ prices are listed below:Betfair SP percentages returned1st race: 95.7 per cent2nd race: 99.1 per cent3rd race: 100.8 percent4th race: 98.6 per cent5th race: 102 per cent6th race: 100.8 per cent7th race: 98.4 per centPrices of winnersCommit To Memory (3-1 SP = 4) 4.4 Betfair SP Longoria (13/8 SP = 2.62) 2.69 Betfair SPKylkenny (5/1 SP = 6) 6.7 Betfair SPDancing Deano (9/2 SP = 5.5) 7 Betfair SPDart (1/2 SP = 1.5) 1.59 Betfair SPIngleby Arch (9/2 SP = 5.5) 7.2 Betfair SP Dado Mush (28/1 SP = 29) 40.18 Betfair SP