Yes that's my RG500 no.73. My first TT, think I finished 9th from the back of the field. No priority given then for winning the Senior Manx the previous year! And proof as I've said many times, that your starting number doesn't really matter, although you'd probably go for an earlier number if you had the choice.
It was a really good bike. Bought it off Padgetts. They said Gary Padgett had raced it and broke his leg at Silverstone.
Yes, that's Nigel Everett, and yes that'll be either Peter Linden or Peter Skold's bike, the RS500.
Lovely photo, and brings back memories. By the time that photo was taken, we were probably all cheesed in the beer tent!