The Sea Meteor was never armed in real life unlike in-game.
To be fair, it has been given out only thrice, with the most recent instance being an item in the Warbonds shop in late 2016, long before France became its own nation in-game.
The D.521 was a single French prototype that never found its way on British hands, and is present in the British tree as an extremely rare event vehicle.
Ace Custom: Robert Tuck's Gladiator, John Plagis' Spitfire LF Mk IXc, and James Prendergast's Spitfire FR Mk XIVe.
South Africans with Surface-to-Air Missiles: The South African Army is represented as a branch of the British ground forces tree, featuring the Marmon-Herrington and the Eland armoured cars, the Ratel IFV, the Rooikat wheeled AFV, the Olifant (locally-refurbished and redesigned Centurion) tank, and the TTD prototype.
Aussies with Artillery: Australia is represented by the Wirraway and Boomerang aicraft, the AC4 tank, and the Royal Australian Armoured Corps' Centurion Mk.
Other notable entities that are part of the British tech tree: As of 2019, the Royal Navy is now playable in naval battles. Version 1.55 "Royal Armour" added a full line of non-premium British ground vehicles with more slated for the future. Version 1.53 introduces the much-anticipated Hawker Hunter F.1 and British ground vehicles, though the latter is limited to a half-dozen premium tanks including the Black Prince, Sherman Firefly, A13 Mk II, and Achilles. As of 1.49/(AKA ) Naval fighters have been added. The RAF is fully playable, and brings out all the famous toys, including the Hurricane Series, the Spitfire series, Lancaster Bomber, and even the Fairy Swordfish.