http://news.bbc.co.uk/1/hi/england/london/7401982.stm
Well this is good news but it doesn't surprise me in the slightest. There was a great deal of reader comment posted on a local newspaper website (since removed) which indicated that the attacker was well known although it's still not clear if they are one and the same person. Quite why the police didn't release any details of the assailant after the attack though is beyond me but Derek S might be able to shed some light on that...