Great interview.
PS FWIW I view Rega as being up there with say Walker-era Quad in having a remarkably consistent yet highly individual engineering-led vision of audio. One of very few brands I’d mention in that company. Roy had a really good idea in 1973 and has refined and developed it ever since. No flip-flopping over the map following trends, no hype, no nostalgia, just one coherent vision that grew into a full product portfolio with research and development over many decades. I like the way you can look at their current speakers and tell they were designed by the company that designed the turntables as the underlying logic is so consistent.