Taking kids 6 and 9 to London. We'll be staying near Earl's Court Station. I'm planning to get zone 1-2 Travelcards loaded onto an Oyster card for the adults. Within zone 1-2 I'm pretty sure kids under 11 are free, but I'm a bit confused for when we travel outside those zones. We're planning to go to Warner Bros. Studios and Hampton Court. I'd like the route with the least transfers.
For Warner Bros. Studios, looks like we can walk over to West Brompton Station and take the Southern Milton Keynes Central direct to Watford Junction
For Hampton Court, looks like Earl's Court Station to Wimbledon on District Line, then South Western Railway to Hampton Court.
Reading that on national railways, only kids under 5 are free, but there are certain exceptions where the trains run on the same lines - I'm very confused! Hope someone can clarify. Thank you!