If you use a pot at all, make sure it is pre-warmed. (I would add that you should do the same thing even if you are only using a cup or a mug.) Stir the tea before letting it steep. But this above all: “[O]ne should take the teapot to the kettle, and not the other way about. The water should be actually boiling at the moment of impact, which means that one should keep it on the flame while one pours.” This isn’t hard to do, even if you are using electricity rather than gas, once you have brought all the makings to the same scene of operations right next to the kettle.
It’s not quite over yet. If you use milk, use the least creamy type or the tea will acquire a sickly taste. And do not put the milk in the cup first—family feuds have lasted generations over this—because you will almost certainly put in too much. Add it later, and be very careful when you pour. Finally, a decent cylindrical mug will preserve the needful heat and flavor for longer than will a shallow and wide-mouthed—how often those attributes seem to go together—teacup. Orwell thought that sugar overwhelmed the taste, but brown sugar or honey are, I believe, permissible and sometimes necessary.