One problem could be mildew if you have a steamy bathroom. On usual surfaces you can wash it off then redecorate. On PVC you may have a problem painting it.
Thank you very much. I had heard of problems with condensation but I will be having a better extractor fan fitted.I'll also need different lighting or so I was told so I'll just have to think what sort of revamp I want.
Fix battens to the ceiling first (25 x 50mm treated timber.) Fix the cladding to the battens.
Apart from being a better job, it would allow you to run lighting cable through the void (space between the ceiling and the uPVC.) This way you can have as many lights as you like without having to get access above the ceiling.
My daughter agrees with you,-Talbot-.Decisions,decisions.I'll probably just keep the ceiling-it's easy to clean and I didn't want to change my lighting.
Anyway thank you all for your input.