In message , Kroma
writes
Also, if I turn off the power to the
upstairs electric sockets - the upstairs extension goes dead.

WHAT????????????????????????

Sorry but I can't think of anything else to say.

Is there a cordless DECT or similar phone plugged in upstairs? Therefore
you are cutting the power to its base unit. Surely you don't mean that a
plugged in normal phone stops working when you turn the power off do
you?

--
Bill