This is a great little group called Show of Hands and these two songs can be found on Centenary: Words And Music Of The Great War which is a 2-CD set at a great price. One CD is music with poems read by Jim Carter (Carson the butler on Downton Abbey) and his wife Imelda Staunton (Dolores Umbridge in the film adaptation of Harry Potter and the Order of the Phoenix).
Show of Hands, of course, is Steve Knightley, Phil Beer, and upright-bassist Miranda Sykes.
Knightly, along with being a phenomenal musician (as are Beer and Sykes), has a degree in history and his grandfather, Sergeant Thomas Knightley, served in The Great War. If you have never hear of Show of Hands, plug them into Pandora for a listen!