He died in 1866, I will add the answer to this post on Saturday 23rd.
Perhaps this was not as easy as I thought, we had no replies. I can now inform you that it is Thomas De La Rue (1793-1866).
De La Rue are the current printers of Machin definitives in sheet form. Thomas himself was a pioneer printer of the Victorian era, an historic figure for playing card collectors and philatelists.