Moved to Tech.
I have one of these to switch between my SkyHD box & my PS3 -
Joytech HDMI Tri Link switcher
£30 at Amazon, although I bought mine for £10 in my local Gamestation (not sure if they were knocked down or it was a mistake).
It's a powered 3 port switch with a remote control.
I have also seen these two recommended on other forums:
4 port manual switch box for £15
http://www.vivomounts.com/4_port_hdm...__splitter.asp
3 port powered switch with remote (& built-in amp apparently) for £30
http://www.vivomounts.com/3_port_hdm...ac_adaptor.asp