PS Vita TV – £93.57
PS Vita TV – £93.57 delivered
Or get one with a controller and 8gb memory card for £124.77.
This is region free, and doesn’t currently have an announced release outside of Japan.
You may be hit with import duty (although I never have with orders from Play-Asia).
Update: It seems that Sony haven’t actually confirmed that this is region free. The PS Vita is, so it seems unlikely that they would region lock the TV version, but who knows.

Aww, Jan 2014 release date. Can’t wait for this thing.