The British tank tree will be similar to the French tree, that is focus on one thing early then switching later.
Yes the british heavies will have extreme armor tier 2-5, and later go much weaker but have much more firepower, similar to the uber turreted American heavies.
Mediums will be pretty average early, mid they get big speed at the cost of firepower, and later have a great balance between the three, with most focus in firepower(20 pounder, 105mm rifled)
The Tortoise would be odd. Its quite similar overall the the T95 but different in alot of ways. Its more lightly armored, larger, but faster with lightly sloped armor.
Sherman Firefly and Achilles would be big things I would like to see, as NON-PREMIUMS, hint hint. They were basically just M4 shermans/M10 wolverines, respectively, with 17 pounder anti tank guns, and were made far before the M36 Slugger or M26 Pershing came out, giving much needed firepower against heavy German vehicles, like the Tiger 2 and Jagdpanther.
the 20 pounder tank destroyer(Cromwell with 20 pounder) is also something I want to see. Archer, naw, great firepower but no armor and backwards facing means easy engine damage+low profile means bad field of view.