I have a child at home who has learning difficulties. Sometimes she jumps up and down on the floor. Recently this has caused the downstairs living room light to flicker. Upstairs under the floorboards I found a connector block with the three wires from the living room light switch going in one side and obviously three wires leaving the other side. Oddly the bare earths were just twisted loosely together underneath. Now I may not be a qualified electrician, but it's obvious that twisted wires isn't what you are supposed to do, so I replaced this with a six connector block strip and connected the wires back up properly. The light then worked correctly. The other day it started flickering again and after going out shopping for a few hours I returned and the light no longer worked.
In the switch on the wall the two incoming wires are live in the off position and the single outgoing is zero volts...with the switch in the on position all wires are live. At the light itself both pins are live when switched on.
is this caused by a broken neutral or by possibly something else, if so any pointers would be helpful. All other lights work without fault and live testing was done with a screwdriver as I do not have a test meter...a bulb will light between live and earth in the circuit.