This month we have the recent new values, all M19L MAIL an showing a bright fluor.
Next we have two 1st Class issues, each in Royal Mail red. The M18L MSIL stamp has a brighter fluor than before and the M19L MAIL is the first with a 19 code.
The £1.55 in marine turquoise is also now showing a MAIL M19L code, as are the 1st Large and 2nd Large issues.
Everything here is from Walsall.
It should also be noted that the 1st Class Machin in the Birds of Prey Concrete & Clay book seems to be a distinctly darker shade of Royal Mail red.