Much the same as a regular ISA, but with a £9,000 annual contribution limit. The other restriction is that you can’t withdraw from it until you’re 18. At that point it turns into a regular ISA, and you have control of it.

Many parents think about using Junior ISAs, especially if they have used up all of their own tax-free account allowances, but the downside that gives a lot of them pause is the fact that their 18-year-old gets full control and can cash everything in to spend on booze and fast cars, if they want to.