This page covers local repair work on existing circuits where the issue looks contained and the aim is a tidy, well-explained fix. Straight like-for-like accessory refreshes often belong on sockets and switches ; repeated trips and unclear wider symptoms usually belong on electrical fault finding .
Quick fit check: stay here for a contained fan, spur, pull cord, hood feed or awkward local point. Use electrical fault finding when the symptom repeats, affects several points or has no clear local cause. Use emergency electrician if there is heat, burning smell, visible damage or a breaker that will not stay on.