The pot's the thing!
Warm the pot with almost boiling water, so you can barely hold on to the sides, empty the water out just as the kettle comes to the boil for making the tea (fresh water, not second boiled).
Add n serving (bag / teaspoon of loose) per person, plus a serving, to the pot and pour on enough boiling water for the number of mugs/cups you are intending to pour, then put the cosy on the pot. Now leave it to mash (don't force it!) for 3-7 minutes.
Milk of choice, in quantity of choice, in the bottom of the mug then fill with tea (stops the milk scalding and tasting weird that way around).
If forced, allow others to add their preferred quantity of sugar (bleuch!) and enjoy.
Or when in the office, bag in mug, boiling water on bag, nip for a wee to let the tea brew (yes, washed my hands, thanks!), remove bag from mug, add splash of skimmed milk, just enough to make it cloudy, then find desk and consider code. Repeat at regular intervals throughout the day, whenever faced with an intractable problem, or when you've just solved an intractable problem.
Key to proper tea is to never, ever, WASH the brewing vessel - that's where the taste is!