Train strikes: Boris Johnson calls union action ‘unnecessary’ amid second day of rail disruption – as it happened

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Crowds of holidaymakers are fretting about missing their flights as train delays have left them stuck at London's Liverpool Street station, PA reports.

The Stansted Express normally leaves twice an hour from Britain's third-busiest station, but strike action has reduced this down to one.

One man, who was returning to Sofia in Bulgaria after three days in London, complained that the experience was stressful".

Asked how much longer he expected to wait, the man - who had been stranded at the station for half an hour - said: I don't know, I'm just looking at the board, I hope not too long."