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1st class Large from booklet of 4, 2015 version M16L MFIL.
The 2016 version of the booklet appeared at the in May 2016
SG U2974 (also used for earlier years).
This booklet is printed with the first type of Security Backing Paper. (Royal Mail announced that the security printing on the inside of the cover would be changed sometime during 2016 and we expect that some booklets may appear with both types.)