Deputy Mayor Stephen Greenhalgh says often people only go to police stations to hand in lost property, so Post Offices could provide a solution in providing police services, while cutting costs.
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The eagle-eyed resident spotted the mistake on signs just feet apart in south London.
The victim was attacked after bumping into a man at the ticket barrier at Putney Station.
The victim, who is his 40s, was found near the edge of palace grounds.