Keith A of Hertford,
I'm very interested in the origins of 'Merry ploughboy'/'Scarlet and the Blue'. Are you basing your mention of Warwickshire RHA on oral versions as just about every Royal Artillery unit from WWI sang it? Our Wolds waggoners and ploughboys all joined Sykes's Waggoners Regiment in the RHA and it was one of their theme songs.

Has anyone come across a printed version or the original sheet music? Bert Lloyd claimed it was written by John Blockley but I can find no evidence for this although it was probably written about 1870. It doesn't feature on any broadsides I know of.