Alan, it could well - age-wise - be the same John Croall. Guess the one I'm thinking of is about the same age as me -pushing 3 score and ten, so would have been "Blithe and merry" in 1970. As I said, try Greentrax as some of the JTB recordings went out via that stable.
Here's one of Jock Tamson's Bairns' recordings which features both John C and Rod Paterson on vocals:

https://www.youtube.com/watch?v=rxq1-UWGkBI