The UK
needs
more inheritance tax. So does the US.
If the wealthy tend to have more successful children, or even smarter
children, there are so many obvious social causes that there's no
point getting distracted by possible genetic contributions. When they
go to school, they go to a better school, with other good students,
and they make good connections. They have a calm place to study, and
enough food to eat. Even before they start school, they are probably
taught a better approach towards learning and success.
These are things that we can give to children in poor families. All
we need to do is tax the rich to a fair extent (much more than now).