Most guides give a single number for how many downlights per circuit and stop there. In practice the breaker amps almost never decide it. This guide shows the three-line sum from driver watts to amps, why the dimmer rating and switch-on inrush bite first, and how to split a house by zone. It includes a worked 24-fitting example, a dimmer check and four in-stock Luceco fire-rated downlights with prices checked on 20 October 2026.
An LED bulb that keeps glowing after the switch is off is usually a harmless leakage current, but sometimes it points to a wiring fault. This guide explains why LEDs show leaks that old filament bulbs ignored, then covers the five usual causes: illuminated switches, dimmers, long cable runs, the lamp itself and a switch wired in the neutral. You get a safe diagnosis routine, a worked example and the fixes worth buying.
Look at any UK plug and the top pin is longer than the other two. It is not a quirk of manufacturing. The longer earth pin is the key that opens the safety shutters in a BS 1363 socket, so a key, a hairgrip or a child’s finger cannot reach live contacts. This simple guide explains how shutters work step by step, why some earth pins are plastic, where the 13A plug came from, and what to check when you buy sockets for your home.
