John Hegley has written a poem to celebrate 150 years of the Tube. Here, he reads and sings his new composition.
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Armed officers have been patrolling on the London Underground but this is the first time they will travel on trains outside the capital.
A post-mortem report found no traces of drugs or alcohol, and the evidence suggests Simon Brown was not taking photos.
The masked men used an angle grinder to tear through the lock.