The UK's sweltering temperatures could cause chaos for power grids – leaving Brits at risk of blackouts this summer.

National Energy System Operator (Neso), which operates the electricity grid, warned that a surge in wildfires could plunge parts of the UK into darkness.

There has been a 600 per cent increase in the number of wildfires tearing through the UK over the last two years, according to the National Fire Chiefs Council.

These fires don't just damage homes and wildlife; they also pose a serious threat to the pylons and transmission lines that make up the backbone of the grid.

Many of the UK's 22,000 pylons and much of the 13,000 miles (21,000 km) of high–voltage transmission lines pass through upland areas that become a tinderbox in hot weather.