Hmm I like it, but I think more ideas from the American show should be experimented with in BBUK (if it is ever resurrected).
HoH (Head of Household) : I think this should be brought back, but not in the half-assed BB9 implementation. The HoH should have his/her own bedroom and be exempt from nomination for a week. There should be a task to determine who is the HoH every week.
PoV (Power of Veto) : A bit like save and replace only the name is better!
And one vital thing (that isn't from BBUSA):
CHANGE VOTE TO EVICT TO VOTE TO SAVE.