With this in mind I asked the thinkness of the said bath (antilles) and
was
told it was 5mm acryllic.

Personally, I wouldn't touch plastic with a bargepole however thick it is. I
know they come in all sorts of wonderful shell shapes and suchlike, but
being a porky sort, I like to know the bath will remain approximately where
it is when I'm getting into it.

Christian.