Let’s sum it up. A single ride: £2.80 to £6.70. A day of unlimited travel in central London: about £8.50. A week: about £44.30.
For the ultimate hack: Use a contactless bank card or phone. It works exactly like an Oyster, but you don’t have to carry a separate card. And it’s magically the same price.
So, how much does the Underground cost? Enough to make you think twice. But not enough to stop you from riding the great, glorious, grumpy metal snake.
Now go forth and tap. And always tap out.