From what I can tell, under 11s travel free with an adult on Tube/Bus/TFL/Overground, but you have to have a special oystercard rather than normal contactless?
Other pages refer to photocards for 5-10 year olds, but takes over a week to deliver to a home address (and costs £10), you can't just pick one up in London.
Is this really the case that you need some tourist product or a special ticket?
Children under 11 also travel free on Tube, DLR and London Overground, Tfl Rail and some National Rail services when accompanied by an adult using a valid Visitor Oyster card or Travelcard ticket
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Find out more about London transport, travel around London, Visitor Oyster cards and Travelcards.
visitorshop.tfl.gov.uk
Other pages refer to photocards for 5-10 year olds, but takes over a week to deliver to a home address (and costs £10), you can't just pick one up in London.
Is this really the case that you need some tourist product or a special ticket?