Harry being a keen cyclist was one of the big features of his character when he first joined the cast. Before he moved to Ambridge, he cycled over from Borchester to do his milk round every day. I thought that was a strong, positive message, especially in the context of the difference between his character and that of the unsympathetic layabout Jazzer.
And Lynda has always used her bike as her main means of getting around the village. I guess it only gets mentioned when it becomes a plot point.
Anyway, I gave up the Archers a few months ago. It was just getting too irritating.
d.