I just checked and it says they moved their operations to the UK, but every time I ring I get diverted to an international ring tone, all their staff names are foreign (which doesn't mean much I suspect thats the case with most of London admittedly) and they appear to operate on GMT+1 time, also the only address they give is a forwarding address.

I don't think any bitstamp employees are actually IN the UK, despite what they may claim.