> So my cooker hood has two halogen bulbs. When plugged in independently they work fine but when both are plugged in, they flicker. They have worked fine previously. Does anyone know what might cause this please? I've just spent an hour crimping molex connectors with a pair of pliers thinking a loose connection was the problem, but no.
Are you sure you're not using LED replacement bulbs? I had a similar problem and it took several purchases before I realised that the transformer was an older unit that couldn't cope with all of the bulbs in the set being LEDs.