Geoff Mackenzie wrote:

I heard he had given up the domestic scene and moved into stadium
concerts and so on. Still around? Well regarded?

He did a stint as a journalist/reviewer in the pro audio sector in the 1980s and also designed a range of pro power amps made by a company called Rauch. These are still well regarded, but the company went bust. I met him briefly a couple of times and he was very pleasant.

Stephen