Well I've just visited the local Vodafone store. They are not taking pre-orders. First come first served, but he doesn't think they'll get many in, less than 10, probably only 6. They got three 3Gs's in on the Vodafone launch day earlier this year.
My local Vodafone has theirs (it's a city centre shop though) and said they had more than 60 and were expecting more tomorrow. Had both 16 and 32, but no white til mid-July.