Thank you for replying.
Well once upon a time 18 years ago, on a cold winters day. lol
This house belonged to the council ( we purchased it a little time later) the council came out to check the electrics, when the guy was in the dining room he had a meter thing checking the wall socket, this was when he told me there was a problem with the continuity,he told me someone would be back to check/repair it, ( no one ever arrived) now the double socket in the living room ( other side of an arch wall, from the dining room). had previously been the only socket between the two rooms, the tenant before us had fitted a double socket in the dining room, this was fed from the double socket in the living room, so I'm guessing it has something to do with the previous tenant's work.
We forgot all about the continuity problem until we decided to purchase one of those ultrasonic bug chasers, it sends a signal through the house wiring terrorising the creepy crawlies, I said to my husband " it may not work if the continuity has been broken".( don't ask me why I only remembered this now) lol
So here I am asking this question.
Hope this all makes sense
Lynn