April 2015: first reports of this booklet with 2015 coding.
12 x 2nd class blue booklet with source code MTIL and year code M15L Security Backing Paper
Cylinder numbers: W6 (blue), W1 (iridescent) W3 (phosphor) - the numbers are now hidden by the front cover of the booklet.
This version has security printing on the backing paper, first found in early 2016.
Small number of Cylinder booklets available.
Printed by Walsall Security Printers.
SG GB Concise 2016 catalogue - new number allocated ME6. (Also used for M16L printing)