I only went into Wayland's a few times but it was very much like Goodyear's in that respect. When Alf eventually retired, the model shop separated from the newsagents and was run by a few different people. At one time it was known as Premier Models which is probably the name you remember.
Super Models in Spondon was run by Dave Heaton and then later his son, Mark, but as you say closed at least 10 years ago.
Terry Tippett was the brains behind Micron radio and at one point had 3 shops, all in a small shopping precinct in Sandiacre, not far from M1 J25. Micron radio was very popular in the local area at least but struggled when the japanese manufacturers started to flood the market with cheap (relatively) radio in the late seventies.
My first radio was Micron, too, and I still have it somewhere, I think. Converting it to 2.4GHz is an interesting idea but I think the DEAC pack would need replacing!