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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Police said they are "extremely concerned" for the welfare of a "vulnerable" mother and her two children who have gone missing in Bexley.
It is hoped the 7,400-mile journey will become a cost-efficient and time-saving way of transporting trade between China and the UK.
The Supreme Court is set to decide on whether disabled travellers are legally entitled to have priority use of wheelchair spaces on buses.