Don't extend a pinkie when sipping tea. Don't put a used teabag in your teacup saucer. Use a tea caddy. Never drain a teabag by winding the string around a spoon. Never place a teaspoon on the saucer in front of the cup.
Milk is poured in after the tea.
Lemon is always thinly sliced. Lemon is always put in the tea last. Never remove a lemon once it's been added. Never use a spoon to press the lemon in the teacup. When stirring tea, make absolutely no noise with the flatware.