I have taken the photo from underneath, looking towards the ceiling.
I think the channels that the bulbs are in are too small to get my fingers into, but am I missing a trick? They are little halogen bulbs that will pull straight out if I can get purchase on them.
Do I need to unscrew the tiny screws and remove the brass arms? I can’t see what a sort of screws they are, but smaller than any of my screwdrivers anyway, so I’ll need new ones.