The Scottish singer-songwriter - who was best known for hits including 'I Won't Let You Down', 'I Should Have Known Better' and 'Hi Ho Silver' - passed away at his London home, leaving his family "deeply shocked by his sudden death".
The first hit "I Won't Let You Down" was as the lead singer in the trio PhD, with Tony Hymas and Simon Phillips.
A statement added: "He was a devoted family man who loved his wife Chrissy and his children Sara and Lawrence, and the music that he continued to make.
"He dedicated a lot of time over recent years to the Cash for Kids charity appeal in Scotland with his friend Sir Tom Hunter and was still active and well respected on the music scene.
"He'll be much missed by all who knew him and everyone who loved his music and his unique voice and style."
Jim's passing comes just a few weeks after the death of his mother.
He wrote on Facebook on September 28: “Sad to say I lost my mum Sarah last week people say they have the best mum in the world, I did.
“If you look up tonight and see a couple dancing on a cloud to the sound of the Count Basie big band that’s my mum and dad. As always peace to you all Jx"