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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Research into property prices has found London has more areas with an average price of more than £1m than anywhere else in the UK.
A permanent memorial will be unveiled today in memory of murdered Middleton soldier Lee Rigby.
The desk and chair where Charles Dickens sat to write his final novels have been bought for the nation using a national heritage grant.