Refutation - British Y Combinator startups by university:
Cambridge: Immad Ahkund (Heyzap), Jude Gomila (Heyzap), Rahul Vohra (Rapportive), Martin Kleppman (Rapportive), Sam Stokes (Rapportive), Ian Hogarth (SongKick), Pete Smith (SongKick), Michelle You (SongKick)
Imperial: Tim Davey (SnapTalent), Sumon Sadhu (SnapTalent), Niall Smart (Echodio), Nathan Chong (NewsLabs)
Oxford: Peter Nixey (Clickpass), Harjeet Tagger (Auctomatic), Kulveer Taggar (Auctomatic)
Bristol: Tom Riley (Fabricly)
Kent: Mike Laming (Propable)
(Apologies if I've missed anyone/misspelt any names as I'm writing from memory)