I will stay in London between 19-23 of November. I am arriving at Stansted Airport and planning to take a Uber drive to London Barking using the 20 pounds first time user promo. Then I will need transport between 1st and 4th zones (probably by metro) for me and my wife. My daughter is 3yo so I guess she will be travelling free with us. What will be the cheaper way to travel in the city. I am not familiar with your travel cards etc.
Thanks in advance!