Are you awake yet? Good. Here's a little test:
This is block A.
And this is block B.
What's the difference between the two (no points for saying that they are two different stamps)?
Exactly, the De La Rue logo has disappeared! Apparently, Royal Mail now thinks that the way the cylinders are numbered (prefix D for DLR stamps, W for Walsall, etc) is indication enough regarding the printer. Which is true of course..... So they've ordered the removal of the logo. Which is a shame really. Nothing beats trying to find stamps with the printer's imprint still attached.