Thanks for the replies.
I ran pimpmywii and got the auto updates.
Reloaded E.A Sports Active 2 via U/loader with Cios223... the game will recgonize the USB receiver and the leg strap but not the heart monitor.
I'm a relative newb at this stuff, so I'm trying to go through the alternatives...
I'm running PAL 4.1 Firmware with U/Loader 5.01 and, although I can get the game to load up just fine under cIOS 222, the Wii will not detect the USB Receiver whilst the other (The left-sided) USB slot is occupied. Even when I switched the USB ports around and ran the game off disc via U/Loader...