3 January 2013
Security Definitive stamps with U-shaped cuts and iridescent text.
6 x 1st class red booklet
Printed by Walsall Security Printers, source code MSIL, year code M12L
Inside front cover has postcode advert
SG catalogue number MB12
Available with or without cylinder number W6 W1 W1
The cylinder numbers are smaller than usual and are printed further to the left, so are hidden by the front cover