[kalee20]

Woolworths in Barmouth, North Wales had gas lighting in the 1970's till it was demolished and a new store built.

Ten miles away, Dr Williams girls school had two electricity supplies in the very late 1950's. I don't know the details, but they were certainly incompatible and staff had to be careful. My parents worked there (met there). Whether one was a private supply, or whether they were two separate public supplies, I don't know either, and I'd be interested!