Taxis are available outside the Arrivals areas of both Gatwick Airport terminals, follow the signs in the terminal.
Journey time to/from central London is 60-75 minutes depending on traffic.
Going to Gatwick, taxis can drop off on the forecourt of the terminals.
The fare between Gatwick Airport and central London is approximately £100, with an additional £8 if the journey originates/ends in the central London congestion charge area (basically all of central London).
Taxis can be pre-booked and paid for in advance at the Airport Cars Gatwick booking offices in the terminals. Cash and credit cards can be used when pre-paying. Most taxis accept credit cards, but check with the driver.