The Guardian are generally pro-wiki and sponsor quite a few events (e.g. the Hay literary festival).
T-Mobile are the most obvious cell phone company to contact as they have the strongest internet focus. Though there might be problems if we're also being sponsored by Virgin.
Google have a fair sized UK base nowadays.
Other UK new media companies. Shiny Shiny (if they actually make any money...), Torchbox and similar web-design companies. Channel 4 even as they have a pretty large internet arm these days.
Other tech industries. The thousands of companies doing generic commercial database work, the games industry.
University sponsorship. Oxford has an "Internet Institute" for study of the internet. Perhaps if one of the London universities has a similar thing Wikimania could be combined with a more serious academic conference. --cfp14:34, 5 September 2007 (UTC)[reply]