Here's a couple from the JWR Archives from the 1974 meets at Blackbushe. According to the calendar there were three events held at the Camberley airstrip.
Harman.jpg (63.66 KiB) Viewed 4704 times
Impact.jpg (61.91 KiB) Viewed 4704 times
Shutdown.jpg (59.25 KiB) Viewed 4704 times
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The bike in the pic was my dad's and his mate that was the third bike they built