Wouldn’t it be nice to invest something for the kids that would pass on capital gains tax free after 10 years? And you can control how and when they receive the benefits without worrying about others challenging the inheritance in the Will?
Then you might want to consider looking into Investment/Insurance Bonds. There are several providers which provide access to many well-known fund managers.
There are specific rules to abide by and this type of investment may not be appropriate for everyone so consider seeking professional advice.