I've now heard back from James (he was away), and he's raised a good point about whether the WMF or WMUK should have control of these domains and the other UK domains for the WMF's trademarks. I've been in contact with Mike Godwin about this; discussions are ongoing.
It doesn't make a great deal of difference, I guess. We have the trademark license (or at least will do soon), so I don't see why we can't have the domain name.
With the website, the limiting factor is still getting the wiki set up, as I expect we can get the domain names repointed fairly easily. There's been no progress with the request yet, though.
There has been progress - I nudged Brion and he's delegated it to someone, so hopefully they'll do it soon.