Not very relevant Matt....the bike is as the owner says a Vendetta. Gus Khun was not running Seeleys at the time the Vendetta was built and had moved on to BMWs.
The Burton ride mentioned Bob Tait raced in the 1976 ACU Clubmans Championship, as did I on my Rickman Norton 850. My memory is clear that the bike Bob raced at that time had a Norvil PR front end/single disc, so the Spondon set up is later than that.
Whatever, its a nice bike. I am just hoping that Chris can get a motor sorted for his Vendetta soon.....lovely chassis....