Police are hunting a group of men who dressed as police officers before attacking a man at his home in Barnet.
The men forced their way into a house in Barnet an attacked the man they found there.
The householder was beaten and had liquid thrown in his face. The gandg made off with phomes and a wallet.
It happened on August 10 of last year. Detectives have asked anyone who has any information that could help with the investigation to call police on 101.