Indeed, I’m well versed with the MCS / Trustmark / NICEIC and many of the other kwangos. I had to deal with them all at some point over the past year!
You prompted me to look at my Heat Pump installation specs, and it clearly states “type A and AC RCD protection are not suitable. ” The one thing I established over the past year from all the legal arguments, is that the manufacturers instructions – assuming they meet the required standards- are sacrosanct and have to be adhered to first and foremost.
So guess what I will be doing this week !