I'm guessing 1977. Two names that stand out to me there are Asa Moyce, his mum was good friends with my mates mum when I was at college and as two bike mad teenagers we were well pleased to get paddock passes for Brands where A. M. was riding a P&M 900 Kawasaki and a TZ350 sponsored by Mead Speed. The other name is the late great George O'dell, his brother was a customer at work until he retired a few years ago.
Some interesting names on the program, Fogarty,Padgett and Tuxworth. Loved to have been there and watched it as a 8 year old child