There are so many rules on how to make a cup of tea correctly. One friend puts milk in straight after she puts the tea in but my husband declares this approach totally wrong. He puts a little boiling water in first, lets it brew, then tops it up and milk goes last.
I, for all the years I have lived here, have never learned to make a 'proper' cup of tea, and the stuff I make has no flavor. Therefore, whenever I see a British person near a kettle of boiling water, I make them make me a cup of tea because, as my husband says, I can't be trusted with this task.
When we moved back to Chicago after living here the first time, the movers came with their own electric kettle for making tea on their breaks, and it was pretty clear that they'd moved enough Americans that they knew that if they wanted a proper tea they'd have to take care of it themselves. Therefore, Americans visiting here should just give in and leave the tea-making to the experts. And don't even mention sun tea.