Shopto have the F1 game on its own for £31.85 and Play.com has the steering wheel for £34.99
It's late and I've not searched around more for the wheel, but for someone interested in racing the new F1 game with a wheel, this seems like an ideal starter package.
F1 2010 + Logitech Wireless Driving Force Wheel
The Logitech® Driving Force Wireless™ is a one-piece, force-feedback racing wheel
that’s comfortable, easy to set up and store, and cuts down on clutter. Features include
2.4 GHz wireless technology for lag-free control from up to 10 metres (30 feet)
away from the console; force-feedback technology, which recreates
bumps and crashes with exceptional realism; an expandable
lap rest for comfortable game play without being bound
to a table or desk; and built-in gas and brake controls
which put precise, fast action within easy reach.
2.4 GHz wireless technology
Expandable lap rest
Full product support
Wireless force-feedback steering wheel
AC power supply (3.5 metres/12 feet)