Rear fog light only works on the drivers side of the car. Legally you only require one working fog light, either in the centre (as in Pug 206's) or RHS of the car, as in your case. See www.motuk.co.uk/manual_130.htm for more info.
If the tail / brake light set up is the same as my Vectra then you have 2 tail lights on each side of the car, and one of those bulbs is also the braking light (these are single filament bulbs which run at a reduced voltage for the tail light, then an increased voltage when needed for brake lights - clever canbus network stuff).
Should the original tail / brake light fail, then the other tail light takes over the role of tail / brake light. Guessing that the main tail / brake light failed some time ago and you didn't notice because the other tail light was still working and also acting as the brake light.
Edited by Dynamic Dave on 27/04/2011 at 10:47
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