My wife's C3 1.6 Exclusive reversing lights refuse to work. This will be the bulbs I thought, but bulbs were fine. So it must be the fuse. After much fiddling about I checked the fuse which was also OK. So, now I guess it must be the reversing switch or the connection. Can anyone tell me where the switch lives on this model of the C3. Also - the B pillar noise is driving me mad. It reminds me of 'scuttle shake' from a 70's convertible. I've read the posts re the mastic & rivets solution but what causes the problem in the first place? Izzy