There were more than 20,000 crimes reported on London's buses in 2013. To try to cut crime across the network, Transport for London now funds a special unit within the Metropolitan Police - the 1,800 officers of the Safer Transport Command. The most useful weapon in their arsenal is CCTV. There are now more than sixty cameras on every London bus. This looks at what they see - from pickpocketing, which accounts for half of all crimes, to a shocking incident investigated by detective Tony Barun, in which a young man seems to have been kicked through the top deck window of a moving bus.
But such incidents are rare. Fare evasion remains one of the biggest problems - Transport for London lost £19.4 million in unpaid bus fares in 2013. John Burdon has been patrolling the buses looking for fare evaders for the past 21 years. These days his remit also includes attempting to get drunk passengers off the bus - without manhandling them.
Plus a look at Sergeant Darin Birmingham's crackdown on drug-related crime at Vauxhall bus station.
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