Took off the light and there was half a pint of water in. I'm going to pore some light bleach in and swish it round where the mould is and leave for a while. Then get one of those moisture fell packs you get in shoe boxes (as mentioned) and put it inside. Hopefully solve the issue

Yeah, silica gel in a sachet is a good idea to absorb moisture - silica gel beads transition from blue to pink after absorbing moisture; I think you can regenerate the silica gel beads by popping them on a tray and into the oven.
 

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