Appeal after jaw broken
The man, 22, was talking to men and women in the grounds of Chichester Cathedral, opposite the Dolphin and Anchor pub.
He decided to go to the cash point and several people joined him but he changed his mind.
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The attack happened outside Waterstones in West Street, Chichester, between midnight and 1am on Sunday, July 17.
His black Ted Baker wallet, driving licence, debit card and Samsung mobile phone were missing.
Both men were both white and in their early 20s.
Call Sussex police on 101, quoting serial 1008 of 20/07 with any information.