I watched this last night and found it very informative viewing . I totally agree that John Surtees derserves a knighthood .
I did some web searching and found this.
Knighthoods are awarded for great achievement. They tend to be awarded to the most eminent actors, captains of industry, or for some extreme sporting achievement.
To which there is no doubt that John Surtees ticks the last box. 
These honours are given by the queen but these are from recomendation of the honours committee .
There is main and sub committees within this struture . I do not know why but for some reason John Surtees seems to have been overlooked and maybe a bit of lobbying or nominating might get an award he has rightly earned and deserves.