Unfortunately, the car is at the garage, and the MOT certificate has expired. So while I might with a few hours of cursing and cut knuckles be able to take apart the dashboard to remove the lamp, I'd have to do it down at the garage!
I'm inclined to buy one of these sensor emulator things; it's not too expensive, and it'll be the least messing around (if you don't count paying £££ to let the garage do all the work).
Daniele