posts #13 and #14 show totally conflicting info. no wonder OP is confused.com.
It's great that you've followed up. I get depressed (rather too easily) at how often there is a lack of consistency in often very simple things.
I'd probably ignore the building regs angle and say it was not suitable for the influences likely to be encountered under regulation 512.2. of BS7671.
If I fancied an argument that is.
Don't buy a new build...
Don't buy a new build...