My electrician is also solar installer, he gave up on MCS because he saw it for what it is, a sham, many electricians have dropped MCS, just pop over to the
electricians forum and ask their opinion. Go on, have read of that link., it's interesting.
Are you saying that all his customers are going to have issues because they used a fully qualified electrician? DNO do not require MCS, building control don't require MCS, in fact even the energy companies are happy to benefit from your free electricity, wonder why they need MCS? They don't, just an excuse to benefit from free electricity from those that didn't use the sacred MCS installer.
MCS is even causing issues with heat pump installations.
I used so called professionals to build the shell of my extension to watertight, it was a catalogue of problems, foundations wrong, floor slabs wrong, roof pitch wrong, windows wrong. Most people wouldn't know about most of it.
There's a very good reason why I only use trades when I absolutely have to.
Oh yes, there are people who think they can DIY, but they really shouldn't, especially electrics.
PS My electrician installed solar on his own house and gets paid for export, after he pointed out he is fully qualified and MCS isn't required for anything really.