April 2015: first reports of this booklet with 2015 coding.
12 x 2nd class blue booklet with source code MTIL and year code M15L
Cylinder numbers: W6 (blue), W1 (iridescent) W3 (phosphor) - the numbers are now hidden by the front cover of the booklet.
Printed by Walsall Security Printers.
SG GB Concise catalogue - not yet known.