Tea bag in a mug. Boil the kettle. Pour boiling water into mug. Give it a little stir and leave it for a couple of minutes. Remove tea bag. Add sugar and milk to desired taste.
I’d say that’s probably the way most brits make a cup of tea.
Whether or not you have sugar is quite controversial too. I was raised in a "look down on the sugar people" family. Some people are more live and let live. I think I try to be the latter but if you say you want 3 sugars I have my nans voice in my head going "If you hate the taste of tea that much just have something else".