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@Airhead
The check for main bonding is continuity and size of cable. If your supply is PME and the supply neutral is normal size you will need to run 10mm earth cable. As long as continuity can be confirmed you should get away with it disappearing and reappearing. An electrician will not want to put it behind skirting though. Channeling into the top of the wall and plastering over it or running it in the ceiling void would be normal. It should be within 600mm of the entry point. It's common to need it upgrading or adding since the 17th edition, one of those situations where you can usually prove that it makes no difference as most places have gas and water joined at the boiler but the regs take into account all manner of risk not just the everyday.