The jury of seven men and five women took just under four hours to return a majority verdict against Tariq Jahan.
Jahan was cleared of the more serious charge of causing grievous bodily harm with intent.
His Honour Judge William Davis QC will sentence him this afternoon.
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The Commons earlier overturned amendments made to the European Union (Withdrawal Agreement) Bill by defiant peers.
The US Treasury Secretary has also highlighted the prospect of retaliatory trade tariffs if the UK presses ahead with the planned levy.
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