This event took place on the 5th October at BT's building in the City.
http://btosaccelerate.eventbrite.com/
http://upcoming.yahoo.com/event/4423821/.

The highlights for me were Mark Shuttleworth's talk (without notes or slides, but a very cogent and clear summary of "where we are now"), and the talk by Andrew Katz on legal aspects of Open Source.

Some photos.