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Deleted member 9648
Really?Agree with all the comments about the way RCBO's have been used, and never a good idea to lump all power circuits.
Also check that the sockets for your IT equipment have separated earths - two separate earth terminals for each socket.
Get insulation and earth leakage test on hot tub.
And find a new electrician.
It's a house, hardly likely to have enough IT equipment for that to be an issue.