Plastic bank notes were trailed by the Isle of Man three decades ago - so why are they now being introduced in the UK?
Scotland's Clydesdale Bank has issued two million of the polymer £5 notes - which it says are a durable alternative to the standard paper variety.
The bank is one of three in Scotland to release them to mark the 125th anniversary of the construction of Forth Bridge - the Bank of England is looking to introduce them next year.
Treasury Minister Eddie Teare explains what happened to the Manx £1 note version:
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