Queen Elizabeth the Queen Mother was Honorary Air Commodore of Nos. 600 and 2600 (City of London) Squadrons being appointed to the rank in 1949. I cannot recall ever having seen the Queen Mum wearing an RAF uniform.
I was at Biggin Hill in 1955 when she visited Nos. 600 and 2600 (City of London) Squadrons on Saturday 23rd April 1955. She flew from Smith’s Lawn, Windsor Great Park, to Biggin Hill in a Westland WS-55 Whirlwind helicopter of the Fleet Air Arm, making her first helicopter flight. HM was received by AVM H. L. Patch, A.O.C. No. 11 Group. Later she reviewed a parade of both squadrons and watched a formation fly-past of No. 600 Sqn aircraft and a demonstration of Bofors gun-drill by No. 2600 Sqn.
Taken as the Fleet Air Arm Westland WS-55 with the Queen Mother aboard departed from the helicopter pad on the station parade ground on her return to Windsor Great Park. Her visit was not a particularly nice for one airman in the guard of honour when she pointed out to the SWO (Station Warrant Officer) that the airman's shoes were not as shiny as the others with the result that he was confined to camp of 14-days - this "offence" was the talk of the Station and was not received very kindly and left a somewhat bitter taste.
It was also the occasion I believe when the then Under Secretary of State for Air, George Ward, who was present, was seen to be wearing socks of two different colours, one blue and one brown. When this discrepancy was pointed out, he famously commented: "I have another pair with the same colours in my wardrobe at home”!