I read somewhere that heating a runway is too expensive.
Also I have a vague 40 year old memory that the engines only ran at 30% thrust. I s'pose the bowser would be pushed backwards otherwise.
In the 1963 winter I was one of about 30 guys on the runway with shovels in a blizzard and drifting snow trying to clear the snow! Such fun. They wanted to get a Valiant in for a major servicing. It was made even more thrilling by looking out for the mad warrant officer,wandering in the howling wastes,trying to catch us wearing illegal non wool gloves,contrary to something or other.
A pongo was flown in in a beaver to find the runway drains under the snow with a mine detector. He found them and we shovelled them out. Then a Vampire was brought out behind a tug and used to melt the snow which then froze solid in the drains. Such fun. If it appeared in a book of Spike Milligan's war stories no one would believe it.