Goldwatch Blues was indeed written by Mick Softley, who was a pretty good singer/songwriter back in those days.
As for Donovan - well - pretentious and twee are the first words that spring to mind.....but having said that, as the lists of songs above prove, he certainly wrote a lot of seriously great songs.
My favourtite has to be "Sand and Foam" which was on the B-side of something or other in the sixties. Just Donovan and guitar and incredibly atmospheric!