From March 28th 2017, the new 12-sided £1 coin will be introduced in the UK, and from October 15th 2017, the old coin will cease to be legal tender.
This means that any old coins you take back to UK with you after that time, can only be changed at a UK bank or building society, and many/most of those banks have said they will only offer this service to their own customers.
In a similar manner the old paper £5 note will cease to be legal tender on May 5 2017. This has already started to be replaced by the "plastic" (polymer) note, introduced in September last year.
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