i think a suggestion for me would be giving the brits slightly higher tickets than germans, so they could actually try to break out instead of being camped to death by panzers and artillery.
Soon a few commander arty, some LeFH barrages, some panzer rushes,
would force the brits to charge into garawia because of ticket disadvantage and take further casualties...i don't the the feasibilty for a brit victory in even teams.
The brits need to got exceptional tankers in those grant to 1-shot every panzer they see. While it's very possible for an average Pz IVF2 tanker to 1-shot any british tanks they see.
Following this logic if the British tankers sucks their infantry would be hopeless.