Just received an email from Big Del today. The part of interest to Mudcat is as follows. ".....'Portuguese' was written by a chap called Patrick Cogshill. He was a student at Exeter university and he did a floor spot at my gig there - sang three brilliantly funny songs that he'd written - and that was one of them. He dictated the words to me - (I wish I'd got the other two, they were just as good)- and the rest is history. I never saw, or heard from him again - just sort of immediately lost touch, although I attributed the song to him on my first album"Derek says he'll try to check out the Mudcat forum as soon as he gets a spare few minutes.
Cheers
Bugsy