Mauro Demetrio told the jury he was arrested after an officer told him he could smell cannabis and that he was driving in a suspicious manner. He alleges that once in the van a fat officer sat on him and that an attempt was made to strangle him.
The court heard a doctor found bruise marks around his neck when he examined Mr Demetrio at the police station.
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Patrols including local volunteers have been set up after the grisly finds in Thamesmead in the last month.
Thieves targeted a property in Richmond on Monday afternoon.
The station, which saw 44m people commuters use it in 2016/2017, will be transformed into a dining room complete with Christmas decorations.