I don't know who dealt with them last year, but here is something I found on their site:[1]
Of course, I am only copying last year's bid venue here, merely to get discussion going...

 
On 22/08/07, Gary Kirk <gary.kirk@gmail.com> wrote:
Definitely. Lots of people would be fine in hostels too, it depends on the individual. I will go ahead and try and speak to some people at UCL maybe? As they seemed to be up for it for 2007.


On 22/08/07, Sean Whitton <sean@silentflame.com > wrote:
Agreed, we should try and get Wikimania in London. It is a pretty good
capital city as they go and I think we could find a place to have it
with plenty of cheap accomodation nearby (what I mean is Travel
Inns/Lodges and the like, which are pretty decent).

Having a chapter which should be pretty well established by then helps too.

On 22/08/07, Paul Williams < paul@skenmy.com> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Have done, Casey!
>
> Casey Brown wrote:
> > Make sure you are subscribed to
> > http://lists.wikimedia.org/mailman/listinfo/wikimania-tech too then! :-)
> >
> > On 8/21/07, *Paul Williams* < paul@skenmy.com <mailto:paul@skenmy.com>>
> > wrote:
> >
> > Count me in for helping out here! I'd love to see Wikimani come to
> > London - I'm an A/V specialist so I could even run a lot of the
> > technical stuff that needs doing.
> >
> >
>
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--
Gary Kirk



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Gary Kirk