I recently watched an old repeat of Heartbeat and in this episode these hippies/squatters were busking singing what I presume is a Bob Dylan track, I thought it was called 'we'll try to catch the wind' but I cannot find it anywhere. It's obviously not called that so if anyone could tell me what it is called I'd be really grateful.
I didn't see the episode, but I'll take an educated guess that the song you heard was Catch The Wind, and it's by Donovan. I can understand the confusion though: this is the song where Donovan sounds more like Dylan than any other - a fact which gave him some criticism from die-hard Dylan fans at the time. It's still a great song though!