I met my family for a meal before going to the Kew Christmas lights yesterday. One daughter (based in Walthamstow) had travelled there with son and nephew by rail and had been stopped at a ticket gate and told that the boys (both aged between 5 and 11) should have had child tickets. She had used contactless for herself. They were waved through without further ado, but it does pose the question of what is the best way to give accompanied children the same freedom as adults have in travelling around the whole ( not just TfL) network? One boy is 10 so will need an 11-15 Zip card soon anyway.The other is only 7.