And I’m still happy to trial anything in a primary school if you’d like! 
This is a damn good idea. There’s a company called osper.com who are doing something along these lines,
I feel like it wouldn’t be much effort for Monzo to position themselves in this space.
Either through:
- dual logins (so parent can access, set limits, deposit money, etc)
- child account slaved to parent account (‘encourages’ parents to open an account too
)