Queens Jubilee
 

When I first went to Heathrow in the late '70s I was told that the aircraft at the fire training area (later known as Comet corner) was the very aircraft that had flown the Queen back to London after the death of her father sixty years ago today. Can anyone confirm this?

I think not - the aircraft dumped @ Heathrow for apprentice training was G-ALHJ. (I started work there in June 1970)

On 7 February 1952 HM Queen Elizabeth II arrived at London Airport from East Africa in BOAC Argonaut G-ALHK 'Atalanta' , following the death of her father, King George VI.
I believe HK was scrapped in Denmark in 1965