...one of my sidelights (front) has gone, so I need to change the bulb. Can't see a way in to it from the back, as it seems to go into the wing.
Do you have to take the sidelight off the car to change the bulb?

Yes Mike you do have remove the sidelight to change the bulb:

First undo the Phillips screw above the light, pull hard straight towards as you are facing the front of the headlight/sidelight units.You have to be brave and give it a fairly strong pull forward. the ball & socket type clip can be very stiff. Swap the bulb, then push the light back in, and refit the screw

Andrew

Ta. Will give it a go tomorrow.