I have just seen over on the Wigwam that Richard Dunn has passed away. Remember his system many years ago at Scalford but otherwise didn't really know him.
https://hifiwigwam.com/forum/topic/134078-richard-dunn/?tab=comments#comment-2398352
https://hifiwigwam.com/forum/topic/134078-richard-dunn/?tab=comments#comment-2398352