It is very sad to hear this and signifies a passing of time for me.
The first time I saw Peter ride was the 1972 Hutchinson 100 (Brands Hatch Backwards!) Where he did heroic things with the Arter Matchless and Agostini threw his MV up the hill into Druids! This was actually the first road race meeting I had been to, and it left its mark, which drove me to go racing in '75 on my Commando.
I met him in '78 at the Earls Court Motorcycle show of that year, where I exhibited my Rickman Norton on behalf of the RAF Motor Sports Association and Peter had a stand for his dealership in Southampton.
He gave me lots of useful input regarding the 850 motor which had a lot of Thruxton parts including a cam he designed, but Norman White later told me at one time there was around one new profile a week, such was Peter's output at the time! Peter was interested in the RAF aspect since his father-in-law was a retired RAF officer and had been instrumental in Peter recuperating from his '74 accident at RAF Headley Court, without which it is likely his post accident disability would have been even more restrictive than it was.
I was lucky enough to meet him again in 2015 at the UK CRMC annual dinner, an event at which one of his replicas was displayed in I think 2017.
Like others I had been enjoying the banter between Norman, Dave Croxford and Peter on social media recently, and had hoped it would continue, sadly no.