The tube is quite expensive (although cheaper than cabs or tour buses) but if you are traveling around London a lot in a day, definitely buy a day travel card. If you’re in London for longer, get an ‘oyster card’, which you then just have to top up on a machine – much faster than waiting in long lines to buy tickets each day!

If you’re in a hurry and are able.. avoid the Circle/District line. They are the only ones that are really known among locals to always experience delays. They also have a knack for giving people who usually don’t get motion sick problems.

Also, if it does snow… just try to stick to the Victoria Line. It’s the only one completely underground and the underground experiences severe delays (or cancellations) on all other lines.