In the old days the footman would prepare the tea in the pot on a tray and then pour the tea from the pot into the china cups which he would hand round. Then he would pass round a tray with the milk jug and sugar lumps with little tongs, so you can add milk and sugar to your taste.
FACT
For builders tea, in a mug, it’s still tea first (or rather hot water onto a tea bag), mash with a spoon for requisite time and then add milk and sugar to taste. Usually lots of sugar.
For football ground tea, in a polystyrene mug the teabag remains in so the tea continues to brew and gets progressively unpalatable. It has to be unpalatable to make people prefer bovril. The FA need spectators to drink bovril because they bought up the remaining stock of bovril drink from BovCo in 1979 and are still getting through it (they also got a job lot of Wagon Wheels which is why the 92 football league grounds of England and Wales remain the only place you can still buy official sized wagon Wheels)
Also FACT