Originally Posted by AngryPixie

Mmm perhaps they should have done more testing.

Had a "keep in-play" lay on Slim Pickings in the Grand National this morning. Last price before the jump was around $12, and as soon as the market suspended and before going in-play, my $7.40 lay was matched. So I'd been matched by Betfair, not another Exchange client. Seems there was a massive difference between that money available to lay and back at SP on the winner, and the Betfair matching engine stepped in. After the race all such bets were voided as the resulting Betfair SP market percentage ended up around 166% - much worse than the industry SP. I'm familiar with why this happened but ... my lay was placed in good faith, and would have been matched as the race went on, yet a foul-up at the Betfair SP end see's my winning lay made void!!

Not good enough Betfair!!!!!