The problem presented early sat morn, no other lights were on. i had
switched the dining room lights on, they were on for 30 secs then pop
like a bulb going and all other lights on that circuit went.
No drilling or nails in the wall not for a few months anyway, but one
curious thing (? red herring) the smoke detectors (which are off the
same lighting circuit) went off last thing friday night (burn toast).
I work shifts, so getting daylight time to look at it is getting hard,
so have isolated that circuit, bought a load of small lamps, will
have one last good look on wed, then out with yellow pages.