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.
Vickers needs a higher Suppression/dps ratio, hopefully more Suppression. My criteria: it should suppress charging Pgrens or Obers without getting naded in the face if it starts shooting at max visual range. Should be a mild number change.
Ro.E need to be more combat capable, so the AO has someone to buff. Or the AO needs to be able to buff himself. Increase far damage of Sten and make their Vet 1 bonus not require cover. Heavy Ro. E may become viable IS replacements.
Give AO a Vickers upgrade. Double bren dilutes him.
Mortar Pit needs faster tear down and for IS to tear them down too. And for pop to change with upgrade, 5->8. Modders have worked out how to do that with Bunkers. Having your CQC do that... means when you lose an engagement there isnt any back line troops to rip it apart. Losing 150 MP is pretty dang rough. Also, stop spamming the upgrade on your Mortar Pit. A 1 mortar Pit placed pretty far back is a super strong smoke dispenser. A 2 mortar pit is friggen expensive. Incentivize 1 mortar Pits.