Originally issued 3 January 2013 - 20p light green Machin definitive from counter sheets
The 20p stamp was reprinted on 14/02/18 by ISP Walsall for the first time, and was distributed by Royal Mail Tallents House on 23/05/18. Phosphor glows yellow under an ultra-violet lamp.
SG U2924 (as in previous years)
Cylinder blocks of 6
Date blocks of 8