We are traveling with our 14 year old twins in August. We will be in London for 6 nights. I am considering getting a 7 day Travelcard for Zones 1 and 2, but I read that children age 14 and 15 are free on buses and trams anyway. Also that the Oyster card gives a discount for kids this age.
Do I need to get them a 7 day Travelcard or just a pay as you go Oyster card, since they are free on buses and etc.? Do they need a picture card too?