Thank you for the vote of confidence, Gem. Unfortunately I don't think I can help very much, other than to say, he definitely did not ride for Norwich. I don't know of him riding for Wimbledon either, but I'm not totally sure about that.
p.s., just found this in the 1954 Stenner's under the report on Stoke: "One man deserved a medal for his constant trying, Don Potter. Model of a good teamster, Potter whipped life into the Sun Street side at the end to see the season out with at least a moderate amount of home success."