Bruce gurgled happily, sounding much like they
were saying:

Where's this electricity coming from, then?

From a 13A domestic socket or a dedicated three-phase charging pillar.

I was thinking about a bit further back in the wiring than the socket.

The problem is, you weren't thinking at all.

I certainly wasn't thinking about magic electricity trees, with an
infinite supply of totally clean and efficient power generation. Were you?