I wish I could accurately date this, but alas, I don't appear to have the entry lists or results from the annual Silverstone Winter Sprint Series of the early 1970's.
I do know that is Bob Brewer (TVR). Five Saturdays on the trot, often waiting for the mist to lift before we could practice. Mind you, huddled in the steamy Silverstone paddock café, with a big breakfast, having driven up for two hours after a 10 hour a night duty was always worthwhile. Competing for the day then heading back for a couple of hours kip before the 9pm start of the next ten hour shift, I could cope with - back then....
1980
1987 I think
1991?
2002 FoS
2019 Leadfoot