Yes, I didn't think of the 30 amp circut that would also be needed. Pretty sure my house doesn't have that (though my office does, I think...)
This is the sort of thing I'm talking about, in case anyone has never heard of it: http://www.amazon.co.uk/dp/B00280ONB2
Judging from the comments, it seems UK homebrewers have already adopted this for a brew vessel. It just seems so perfect, it's frustrating that it's unavailable / probably wouldn't work over here.