BAS, thanks for link to plastic ceiling nightmare!
That and other comment about mould is making me rethink.... I was awaer of regs and notification etc, but had not thought the ceilng would be such a problem.
Like many poeple my loft is full of C**p and so don't really want to have...
I am refitting my bathroom and intend to clad my ceiling in UPVC shiplap cladding. I want to fit some IP65 Shower rated downlights (5), ideally LV ones with a separate transformer that I can mount in the loft space out of the way.
Is there likely to be any problem with heat build up damaging...