if you haven't already found the other answer, which worked for me, here you go...i've 307SW (reg nov 05), and changed bulb in 10mins...open boot, remove black plastic cover in offside trim to rear of light housing...this reveals second wing nut (the first wing nut is in the gulley revealed when you open boot)...both nuts come off easily with wheelbrace but they are made of plastic so be careful not to damage...light housing can then be eased out to gain access to all bulbs...replacing dipped headlight is slightly more interesting!
bonmot
February 2010