I tried GoHenry with my kids and just got annoyed by the app and how it works. Also with 3 kids it got quite pricey 
I opened an account with Lloyds for my 11 year old, she has a debit card she can use in shops, online and ATM’s, has contactless etc. Not sure I’d pay £2 a month for Starling…will be interesting to see what it’s like over and above