"The Natural Philosopher" wrote in message
news
How much of the route from the power station to the consumer is
redundant multi-circuit? At one point, typically, does it change over to
a given house only being fed by one set of wires, and if that line
develops a fault there is no backup circuit?

Typically 11KV is run as a ring - it is here anyway, so the only single
point of failure is the 240V stuff from the local substation.

Out here in a North Yorkshire village there seem to be 11 kV spurs, each
with a pole-mounted transformer to step down to 240V. Where I'm sitting I
can see the end of the 11 kV line and its transformer. Its 240V cables go
underground to houses on one side of the road (probably built in 1950s) and
then come above ground to 3-phase 240V overhead wires to the houses on the
other side of the road (1930s).