I got called to a fault on a garage supply, cavity wall insulation crew had drilled through T&E buried under the render, they called "sparky" and he repaired it with choc blocks, tape and a dollop of silicone, ran new supply in SWA to fix
When I worked for NORWEB in the the 80s, we spent a summer renewing sub mains in flats, similar set up to this, they were the responsibility of said board. Mind you the electrical world has turned on its head since then
Pity it wasn't this one, I remember driving over it about ten years ago, still waiting for my fellow travellers to chip in with their whack
https://www.chesterstandard.co.uk/news/23843797.toll-warburton-bridge-increase-12p-1/