FWIW I was at Biggin Hill in April 1955 when the Queen Mum made her first trip in a helicopter to visit 600 and 2600 (City of London) Squadrons as their Honorary Air Commodore. She flew in from Smith’s Lawn, Windsor Great Park, to Biggin Hill and return in a Westland WS-55 Whirlwind of the Fleet Air Arm.
These two photos show her arrival and departure.
