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Only you should comply with wiring regulations. use a 15/16A ce and Recommend (whatever recommend means) using 30mA 2P Type A RCD and 30mA 2p Type AC RCD

Ah ok so the isolators are literally through the wall (out back of CU) to the outside and along by 2m inside plastic conduit. Does that make it better?

I dont know there are two ASHP supplies with isolators on the wall each with a 32A MCB protecting it The product is a Panasonic Aquarea WH-MDC07H3E5 i believe. I agree from that it probably doesn't have a RCD. Actually according to the full installation manual the values for the circuit breakers...

Thanks I will do that today. I have handover later this morning so will ask then and make sure they give it in writing.

I have a new two month old 18th edition consumer unit with RCBO protection for each  circuit and a simple main switch. The house has a TT supply but has been converted in the past by the DNO to be PME. I am having an air source heat pump installed (panasonic Aquerea) and yesterday come back to...