1.You should get a good map of London, like the A-Z.
2.You should cover your guide book so you don't look like a tourist.
3.You shouldn't go out without an umbrella.
4.You should buy a Travel Card to use on buses and underground trains
5.You sholudn't get on a train without a ticket
6.You sholudn't put your money in the back pocket of your jeans.