At the same time as replacing my tyres, I ask the garage to fit some Richbrook Flush-fitting valves. They give a much cleaner look to the alloys, although they are a complete pain when it comes to checking tyre pressures.

I got these locally for £19.99, but you can get them online from Speeding.co.uk

Update 28-12-2002: I was checking the tyre pressures and when I got to the last wheel, the valve wouldn't unscrew. I used all my strength, but all I managed to do was strip the head on the valve, so I need to either get a new set (don't think they'll sell just the heads on their own) or fit some standard valves.

Update 21-01-2003:After contacting Richbrook, they've informed me that I can order replacement dust caps from Demon Tweeks.