P.S. https://gfycat.com/ko/hairymelodicblackfly this gif is probably the good one to back me up on how commander upgraded tank is useless in dealing dmg.
British Tanks have been nerfed into the ground which is why British have the lowest win rate because they under perform at all stages of the game. Mortar Pit is a failed experiment that simply doesn't work well.
Whermact/Okw will have some form of reinforce near Mortars/Leig and can keep pressure on the Mortar Pit until its destroyed. If they take damage from the Mortar Pit they simply just need to hit R to reinforce and keep the pressure up forever where the British have to reinforce and watch as the Royal Engineers get 1 shot trying to reinforce simply cannot compare.
British need
Universal Carrier able to capture territory like the Kubelwagon
Vickers Benefiting from Bolster - It may be the best at killing Models but sucks for suppression, the one thing you actually need it for.
Mortar Pit replaced with a normal Mortar. Mortar Pit can be doctrinal or added as into Hammer/Anvil and made to function like late game artillery alternative
OR
Tank Nerfs Reverted So that the faction can actually be good at one stage of the game and maybe they will be equal with other factions win Rate.