Dumb question, but can anyone tell me how to get the sidelights out in order to replace a bulb ?

ChrisW.

Open the bonnet, undo the Phillips screw above the light, pull hard (careful not to scratch the paint, and it will feel like it's going to break), swap the bulb, then wrestle the light back in, and screw it.

Thanks Andy.

ChrisW.

For avoidance of doubt - pull hard straight towards as you are facing the front of the headlight/sidelight units

D