It doesn’t sound right to me, as you are installing it I would get a second opinion. I know the a house of single ocupancy over 250m sq. over three floors requires more than linked optical smokes etc.
I would say it is best to take every supply as TNCS as you don’t know what they have done repairing and altering the supply cable down the line. I have seen aluminium concentric joined to old lead paper making the supply TNCS
I'll be taking the lid off next week, I bet the braid isn't connected.
Just noticed the 5 pin 32A sockets haven't got RCD protection either, and there are rubber extension leads all over the floor with various steel items everywhere.
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