Hiya Chevvy - Spot on again ! RNAS Predannack mid 80s ***. Perhaps the experiments bit was too much of an early clue ?
For the unenlightened (including me as of yesterday, tho I played toy soldiers on the small arms range half a century ago)
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"After the war, Wallis conducted model flying experiments with his Wild Goose and Swallow designs at RAF Predannack in Cornwall. The models were launched from a rocket-powered rail sled and remotely-controlled by radio. The rails ran parallel to the main runway, crossing the other runway, although the latter was later returned to use."
*** Edit to add- Lizard Peninsula, Cornwall, England 
Chevvron has declared Open House.