Booklet of 4 x 2nd class Large with year code M18L and source code MFIL, security backing paper type 2
Printed by Walsall Security Printers
Cylinders W2(blue) W1(iridescent) W2(phosphor, hidden by the front cover.
No cylinder booklets available at present.
Stanley Gibbons number RA4 (as used for 2016).