I have two young teens (in the 11-15 age group) and we travel to London a couple of times a year. We have generally used travelcards but often we only need to make one journey on tube/bus so DH and I have taken to using contactless cards plus day return train ticket as it works out cheaper. I wondered about getting the junior Oyster zip cards for the DCs now as we have a couple of trips coming up but they have a £15 admin fee each which seems steep. Is there any other way around this? If we had contactless cards for them too presumably they'd end up paying adult fares.