gas4you said:Approx 18/24 months ago. They may have got round by when the building regs plans were passed before this date
They aint getting "round" anything they are following the regs
You HAVE to install a interlock but its OPTIONAL to fit TRV's
Thats what I was told and I have never read anything to the contrary
Sorry I replied before you editted your post
I edit this at 2201