Fishpie
Well i just got the 5 amp rating from my manual. They may differ actually in the car, i've not looked at mine though...its a bit rainy in Brighton!
The 10amp fuse will not have anything to do with your
problem. The fuse is only there to prevent excessive electricity (current) passing through the wiring, called a short circuit. If this were the case the, fuse would blow and stop this flow of current and the lights would not be on
As your lights are working, this says there is no
problem with the circuit i.e the lights work, just the bit that tells it when to put the lights on, the switch. Sounds like its stuck on to me.
By taking the fuse out the lights should go out, as you will be removing the power to that circuit.
Hope that explains things a bit more.
Subnote, putting the fuse back in whilst driving would mean that your brake lights will be on all the time, I guess that's better than not having any and someone going into the back of you!! I doubt you'll suffer from any tail gaiting either.
Processpaul