John
It was the Esso garage opposite Duxford. Needed some fuel as on fumes. I have always used 97/99 in +8 and 102 a few times in Germany. Have records going back 12 years. It was £1.45 back in 2012, £1.25 2016/17, £1.20 in 2020 and 66p in North Carolina in 2018!