Trevor Parkin was a young bespectacled man who was one of three attendees at Albert Tatlock's horticulture lecture at the Community Centre in October 1971. Arriving on time for the class only to find it delayed due to a schedule clash with Ken Barlow's class for immigrant children, Trevor complained to Albert, Ken and Ena Sharples that his wife was sensitive and he said he'd only be out an hour. Actor Bryan Marshall was credited as "Brian Marshall" in his sole appearance in the role.