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Correct. Guidance from the NICEIC to it's members now is undersized main bonding cannot be left if alterations and additions are taking place.
To the OP. I had a similar problem recently, I got a plumber to install a short plastic section just beyond the stopcock. Was a lot cheaper and less disruptive than getting a 10mm to it on that job. Might be an option for yours as well and covers your ---.
That's not the case going by the guidance endorsed by the IET, and they write the regs. I'll stick with that.
6mm is deemed adequate in any situation.