UK billionaires have total a net worth of about £170 billion. Would it be nice to have some of that? Sure, but it's less than two years of pension spending (£120 billion, and going up by the minuite).
We can tax the millionaires too, but eventually you get to the upper-middle class who are already paying a 45% marginal tax rate.
A dose or two of socialism might get us from 71 to 69 (nice), but honestly I think we're all going to have to suffer from the economic mistakes made over the last 14+ years.