OP - you are missing the point, it doesn’t matter what some electrician tells you on the internet.
What matters is how the electrician who is going to sign the certificate wants the work done.
For example if we tell you that 6mm cable is fine and you buy and install it but when he comes he says it must be 10 then you have wasted time and money.
What matters is how the electrician who is going to sign the certificate wants the work done.
For example if we tell you that 6mm cable is fine and you buy and install it but when he comes he says it must be 10 then you have wasted time and money.