Can someone advise me the easiest way to get from Gatwick North Terminal to Earls Court station . We are arriving on a weekday at around 9:30 am . I read there may be another train to get to that area besides the gatwick express. Just looking at the easiest route because we are travelling with kids. Thanks and if we need to change over to the tube , please advise what line / where to do this. Do we purchase our oyster card at this point ? We are in London 3 days , mostly travelling in zone 1&2. There is 4 of us . How much should we approximately put on each of our oyster cards ?