The festival you asked about was Britain Meets the Bay and it involved quite a few local companies. This was before my time here (British Consulate General) but I belive a wide cariety of companies were involved, and not all food oriented. We don't have any specific plans for the near future but I'm always throwing ideas at London. Sadly, there is so little funding available, I tend to focus on business related opportunities (like bringing UK manufacturers over for the Fancy Food Show) rather than consumer events.
That said, of course I would post any festive events on this board for all to enjoy!