What a rip-off! →[More:]The cash fare for a single journey in London is to rise to £4 (which is around $7.50). That's even if you just go to the next station. Four quid!!
The idea is that people will use Oyster cards (pre-paid cards where the pre-payment guarantees that a much lower fare is deducted for each journey when the card is scanned). But for the casual visitor to London, it is such a damn rip-off.
By the time the Olympics arrive in six years, I wouldn't be surprised if the fare has doubled.