Ray,
Your photos are fantastic. I hope you don't mind this input of why Reg Parnell got in trouble over this incident.
Poor Kay Petre was at the wrong place at the wrong time in car # 3.
""Parnell came from a family which ran a garage business in Derby. In 1933, he was a spectator when Donington Park held its first motor race, and he decided to try the sport. By 1935, he bought an old 2-litre Bugatti single-seater for just £25. It broke its rear axle in the paddock at its first meeting, but buying spare parts for the Bugatti was too expensive, so it was replaced with a MG Magnette K3. Parnell had secured wins at both Brooklands and Donington Park, but in 1937 he lost his licence following a practice accident for the 500 Mile race, at Brooklands. He misjudged an overtaking move on Kay Petre, when he lost control of the MG, crashing into her Austin 7 from behind, causing it to roll. She crashed badly and was seriously injured. She never raced competitively again. Although she put the incident down to ‘bad luck’, the RAC revoked Parnell’s racing license for two years. This meant that he was unable to race."

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(Ken Hyndman )