UK

The Royal Air Force (R.A.F.) doctrine envisioned the employment of fighter aircraft for intercepting enemy aircraft and gaining superiority on the battlefield. The Spitfire, a major British fighter, was an outstanding example, optimized for mid-altitude maneuvering combat and high-altitude interception. Jet aircraft in this tech branch generally follow this concept.
British heavy fighters are worth a special mention. Some of them had been initially developed as bombers but were later modified into fighters. This is why British heavy fighters often feature different designs which are hard to fit in a single concept. Jet-powered heavy aircraft are primarily represented by high-altitude interceptors.
British fighters are often considered the most balanced aircraft in the game, with reasonable climbing and turning abilities, they often tend towards hybridised tactics. However often lack in firepower or durability compared to other nations.
British heavy fighters are similar to their german counterparts, however they sacrifice some climb ability as well as firepower in favour of better manoeuvrability.
British multirole fighters
Note that the UK tech tree presented below is not up to date, it lacks the multi-role line.
U.K. Tech Tree
Fighters
Multirole Fighters
Heavy Fighters
Attack Aircraft
Bombers