The 60% effective tax rate is only on earnings between 100k and 125k, and only because of the loss of certain tax benefits. After 125k it drops back to 40%. It's really silly that it exists, but isn't representative of UK tax rates, it is just a weird side effect of the loss of the personal allowance.
And I reckon most earning between 100k and 125k would avoid that 60% by contributing to their pension, so I don't think many are affected by it.