Cash points dispensing pounds and euros are being installed at dozens of Tube stations. The cash points will appear at 70 Underground stations, including major interchanges such as Waterloo, London Bridge. Victoria and King's Cross/St Pancras.
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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.