June 2015 - originally issued 3 January 2013 with code M12L the M15L version was first found in June.
12 x 1st class Royal Mail Red booklet , source code MTIL, year code M15L
At the beginning of February 2016 booklets were found with the new Security Backing Paper. These have the 2015 year code O15R. Future printings in 2016 have the M16L year code.
Printed by Walsall Security Printers
SG GB Concise 2016 catalogue - new number allocated MF8. (Also used for M16L printing)
Non-cylinder books only at this time.