Ok, the thing about leaving the teabag in after you add milk... eeeeeewwwwwww.
Raised by my little old Irish granny here. There is a way to do tea. It does not involve leaving a teabag in after the milk goes in. Because A:) that's just not done; and, B) because then you can't re-use the teabag! You can usually get two or three cups of tea out of one teabag unless you like your tea reeeeeaaaallllly strong. "Milking the bag" makes it gross for the next cup if the next drinker doesn't like milk in their tea.
Lemon. I had a family member in the military who spent quite a lot of time in the UK. When he'd come home on leave he had lemon in his tea. If he was talking a lot and got distracted, he'd occasionally later reach for the milk and pour it in. It was always fascinating watching him do that, and then take a sip without looking at the cup.... (Hey, I was a little kid. Adults were to be watched like lab rats!)
I imagine I'd make little old British ladies cringe, but quite often I'll just throw a cup of tea with a teabag in it into the microwave to heat it up when I don't need a full kettle or am in a hurry.