One tea-bag makes two cups of tea. Nobody appears to know this, so I've made a guide.
1. Get one tea-bag and two cups
2. Place tea-bag into one cup
3. Fill with boiled water and leave to stand for 20 seconds
4. Give it a really good stir
5. Remove tea-bag
6. Drop tea-bag into second cup
7. Pour hot water into the second cup
8. Give it a really good stir
9. Squeeze bag against side of cup for maximum strength
10. Pour milk into first cup. (Never put milk in before the hot-water, it's common.)
11. There we go, a drop of milk into the second
12. Enjoy your tea with a friend