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London commuters waste nearly two million hours each month waiting for delayed Tube trains, official figures have revealed.

Commuters lost 380,000 hours to broken or unavailable trains, which were the most common cause of delays over the last year - followed by problems caused by passengers, which cost 285,000 hours.

Security alerts cost commuters just 15,000 hours a month - the equivalent of just a few seconds per journey.

An average of 1.89m hours are lost each month by commuters, according to the figures released by the Greater London Authority's London Datastore.

But planned engineering works are not included in the numbers, meaning the true figure is likely to be significantly higher.

There are two peaks in the number of wasted hours - in late April and mid-October, when large-scale Tube strikes hit the network. The first peak saw 4.4m wasted hours in just a four-week period.

But figures are falling. Last year 2.02m hours were lost each month, while a decade ago the number was an eye-watering 3.74m.

The biggest spike recorded in the figures, which go back to 2003, was in June 2004 - when factors including a Tube strike cost passengers 13.2m hours in just four weeks. That's the equivalent of 473,000 hours a day.