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According to a post on BBC.com dated 23 March 2015, the Clydesdale Bank has begun issuing the first of two million 5-pound polymer banknotes to commemorate the 125th anniversary of the Forth Bridge. The polymer note is physically smaller (125 x 65 mm) than the paper note (137 x 70 mm) of the same denomination.
Courtesy of Max Keller, Clea Phas, Claudio Marana, Aidan Work, and James Cadman.