A ban stopping smokers lighting up on London Tube trains was expanded to cover all stations below ground.

Traditionally smoking had been allowed on the Underground, with both smoking and non-smoking carriages provided.

However after a blaze at Goodge Street station in 1981, caused by a cigarette, smoking was banned on Underground trains in 1984.

The ban was increased to cover all stations below ground after another fire at Oxford Circus station trapped hundreds underground in smoke filled tunnels.

Despite this, smokers still lit up on the escalators on their way out and in 1987 a devastating blaze at King's Cross station, started after a burning match set fire to a wooden escalator, killed 31 people.

As a consequence smoking was banned across the entire network.