Amazing !!
I will suggest BAA to arrange a trip to Sweden or Norway so they can learn how to do it !! They can sweep a runway with the same amount of snow in few hours with 5 - 10 of the modern trucks running simultanously down the runway 24/7 and then keep it clean both by sweeping and with the use of chemicals (Urea).
It is amazing why they don't invest in the right equipment, the loss from this winter could buy more trucks than needed, but it seems that it has worked out well for decades with those agriculture tractors so why should they change anything, even the smallest polish airport in the middle of the woods have better and more efficient equipment than the BAA (At least in Stansted.)