It's not unusual to encounter the issue of a radiator not heating up once your central heating is in full flow again. But, if the heating is on, it's clearly not a problem you can leave for long.

There's one energy-saving task many of us are neglecting – and it can boost a radiator's effectiveness by up to a fifth.

Over time, heating systems can build up sludge made from rust, debris, and limescale. This sludge settles inside radiators, ...