Dc is 12 and we are going to London for 3 days. I've googled Youth Oyster cards and they just seem such a faff for 3 days.
£15 admin fee, you have to supply photos/ID/take ID with you to collect them in person. And they save you half on the cap on tubes.
Is it ridiculous to just load my own Monzo up with some money and give her that to tap in and out with? Sure, it's more expensive (is it £8 a day cap? So over 3 days I'd "spend" £12 more than I would with a youth oyster) but it cuts all the faff and balanced against the admin fee, seems a no brainer.