Have just seen that Revolut are now offering junior accounts for standard account customers, meaning the pre-paid accounts are available for no monthly charge.
There are a few limits - £40 max monthly top up/ATM withdrawal for example (which can be removed by having a paid-for main account).
Seems like a good way to try a junior account for children without a monthly fee. There is a £5 charge for the card. Further details here: blog.revolut.com/hel…or/