Anyway huge +1 as a tech-tree AA around 5.7-6.0, this would go a long way towards filling the 5.3-8.3 gap.
I also reckon a dolled up Fox AA (with cosmetics like camo netting, fuel cans, ammo crates, similar to the Ostwind Ost from the Two Fronts pack), alongside 2 Centurion Mk 1s (also with battlefield cosmetics) would be the best candidate for a British equivalent of the Two Fronts pack, following the formula of two ~6.0 heavy hitters with an SPAA alongside, for a whole mini-lineup in one purchase.