Faksta, I've attached the same photo of #8 with caption and courtesy of Bill Sadler himself
The thing is that I remember Sadler Mk1 as Triumph powered and with a different body. I learnt something new today when I read that before it had a Jupiter engine and the pictured body... Such learning is very interesting, though!
I think you'll find that this was Bill Sadler's first special that was developed into the Mk 1 - with a TR engine and different body. A Mk 1 body was also fitted originally to the first Mk 2 before that was replaced with a British-built aluminium body.
By the way, Bill Sadler's
very first race car when he was just out his 'teens was a 1949 Hillman Minx convertible in which he fitted a Ford V8/60!