A man from the Midlands found this 2016 dated new 12-sided £1 coin in his change today (7th November 2016)! He was also recently in Devon and isn’t sure when or where he received it.
Some vending machine company’s do have them for final testing, but they are strictly forbidden to even show pictures of them, let alone spend them! Officially they are due to be circulated in March 2017.
The Check Your Change admin is Mr C H Perkins, publisher of numismatic publications in printed and eBook format. Author of "Collectors' Coins - Decimal Issues of the UK" and other books on British coins and related subjects.