Take my suggestions for what the UK populace would appreciate with a grain of salt, especially as I'm not a comedian.
As far as your suggested names go, I like #4 the best. If you go with #4 I assume some of the topics would be political? Anyways, just brainstorming some topics?
UK bank bailouts or mortgage issues?
EDGY? -> Fergie and her sexcapades?
What's up with americans and Tea Parties?
Obama and birth certificates?
US ARMY and Homosexuals?
The difference betwen the US and the UK. In the UK if you have a
psychic onstage he gets booed, in the US....(he becomes an economist? a right-wing radio host? etc.)
None of the above should in anyway be construed as anything but having fun with the topic. Feel free to ignore it, especially since I am not from the UK.