IntroductionIn September 2015, Royal Mail Wholesale launched "digital stamps", using an Alice In Wonderland 2nd class design or a machin 2nd class design. It was originally a 2 month trial to test the response to mail with a stamp design printed next to the C9 logo and Licence Number.
From 2 May 2016 PPI customers had the option to use digital indica rather than a Postage Paid Impression, with a choice of 3 stamp images: 2nd class definitive letter, 2nd class definitive large letter, and 2nd class special (Alice in Wonderland).
The wavy lines on the Gary Lanham PPI are printed in silver and not the specified black. Others in silver are known.
On the C9 items the digital stamp has no postal function, while on the PPI, it indicates the class of service - 2nd or 2nd large. There are considerable variations in stamp colour, and in stamp size.