6 x 1st class deep scarlet retail booklet on Security Backing Paper type 1
A reprint of the Padlock booklet of 6 x 1st was available from May 2018.
Printed by Walsall Security Printers, source code MSIL, year code M18L.
In summer 2018 Walsall used remaining stocks of the original backing paper (SBP1) on a reprint of the Padlock booklet (and inverted on the Harry Potter mixed booklet). These first appeared in post offices in October.
This is a single from new booklet
SG number probably U3024, previously U2968d as used for previous years.