Hope this is the right group:

"JINKS' STACK is a 3-man acapella vocal harmony group who perform anything from Cornish folk songs to Beatles songs, with the emphasis on the traditional. Lovers of sea songs will find a lot to like here, as well as anyone who appreciates fine harmony. The three voices, representing the full range of male voice, make magic, and you never miss instrumental accompaniments. I know of two recordings from Jinks' Stack: SEE THE BOYS OUT WALKING and SECOND TIME AROUND. I had the great good fortune to meet Jinks Jenkin and his family on a visit to Cornwall. From Brio Music (See below.)"

from

http://www.jimwearne.com/cmus.htm