4) Arriving in Gatwick - You will need to catch the Gatwick Express to Victoria station this is not included on the Oyster Card, but once you get to Victoria you can start using your Oyster Card to ride the Tube the rest of the way into the city centre.
An EZ-Link Card
The Visitor Oyster Card is the cheapest and most flexible way to travel around London.
It comes pre-loaded with a £15 value.
Plus once your credit runs out, you can easily top up with any amount at over 3,000 outlets around London.
You can use your Oyster card to travel on London buses, the tube (London Underground) and the Docklands Light Rail (DRL) as well as London Overground services