Boxer FSV, currently 62 are on order for the British army. And the Base vehicle was just introduced into the game. Along side the more standard boxer variant they are already in possession of, with the same turret as the PUMA, to give them a higher tier IFV.
Challenger 1 GBT155R, a Autoloaded 155 mounted on a Challenger 1 hull, with the ability to fire a 3 round burst in 15 seconds.
FV201: Essentially a Carnarvon with Slightly worse frontal armor and a 17 pounder, basically a combo of the Centurion MK2 and the Carnarvon.
Vickers MkIV: A weird hybrid of a Light tank and a MBT, with a Lightweight aluminum hull, but a steel turret, capable of being outfitted with Chobham armor, That could fit either the L7 105, or a L11 120mm gun.
Cheiftain Mk11, Basically a Mk10 Chieftain, but with some engine upgrades, and replacement of the standard night vision, with a TOG’s sight, The same Gen 1 system used on the Challenger 1s.
FV3805: A Centurion based Artillery piece that would just make a great Derp around vehicle, with its 140mm gun, it had a regeared transmission to allow it to actually move so don’t worry about the fact the hulls backwards, and it even has the possibility of getting a 140mm HESH round.
Olifant Mk1B: Essentially the Olifant MK2 like we have in game, but without the Thermal imagers and slower turret traverse, and likely access to M111 only to balance it out some.