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I recently installed a new ring main and lighting circuit for my kitchen, including a new dedicated consumer unit. Just had the BCO spark round to do final testing, all is well apart from insulation resistance, which was found to be 11 Mega-ohm for both L and N conductors of the ring main...

I'm getting my kitchen ring main rewired, I've had a local professional sparky in for a quote and as expected the entirety of the new circuit needs RCD protection. However, the consumer unit will need upgrading (current unit is old-skool Wylex), and that leads to all existing connected circuits...