eden wrote:
Are the brown cables still connected? Sounds like they might be part of
an overhead supply to the house.

They go directly from my electrical cupboard (through a sort of
transformer box to new cables to my meter) up the outside wall to
about 30cm from the eaves and them they do a right angle and disappear
under my neighbour's pebble dash. Can't see where they've gone after
that.

That almost sounds as if there's a tee from the supply before your meter
that goes next door. Which might be just an easy bodge the power
company did when they buried the wires.

Any chance of a photo?

Andy