I think that makes sense , i'm guessing they were sold to the previous
owner without a lot of research / trial and error being done. I'm
going to live without them on for a few months and see whether a mould
problem develops again (once ive finished cleaning it all off, not
easy on a stippled ceiling).

If the mould problem doesnt come back then I'll get rid of them. Only
thing is i'll have 2 holes in the wall! Cant believe someone paid
£300+ each for 2 of these things.