IASBet

I don't know how this one will turn out, but, having contacted customer support and got a positive response, I deposited £50 into IASBet. Following the Ts and Cs, I bet my entire deposit on there being more than 2.5 goals in the Sunderland v Manchester City game at odds of 2.22, and laid with Betfair £49.78 at odds of 2.28 (£63.72 liability).
Update: Shaun Wright-Phillips return game in Man City colours is a fairy-tale. He scores twice in a 0 : 3 win, and I win £61.00 with IASBet meaning a £2.72 loss. The overall profit is down to £54.81 with a free bet to come (in theory) - but that will be another story.