[Jamie9912]

Even moreso these days, kids are getting their own debit cards.

[andylynch]

All London kids should use a Zip oyster; contactless is always adult fare but with zip it’s child fares (and free buses)

[jayceedenton]

Does anyone know if you can use Go Henry or Hyperjar cards on the tube?

[vidarh]

Yes, you can, at least Go Henry. But you'll pay adult fares, so treat it as a fallback.

[PurestGuava]

So long as it has contactless, it's fine.