Ballad of Vic (?) Williams.Went AWOL during the Gulf War, returned to his unit at the end of the conflict. Gaoled in a classic British miscarriage of justice (apart from anything else the conflict was unlawful, since the UN was acting in clear violation of its own charter). And as I recall there was a further furore when Amnesty International adopted him as a Prisoner of Conscience.
Roy has also recorded it on CD, I think, but I can't find it on his web site:
http://www.stirrings.co.uk/folkzone/artistes/roybailey/index.html
My guess is that it's a Robb Johnson song.
G.