Around a third of brits - supposedly the richer ones - are investing in capital markets, and a large part of these capital investments are denominated in USD. Since the day of the Brexit vote, the GBP lost 20% against the dollar, so investors increased their asset values in terms of GBP by 20% just by the currency devaluation alone.
Following concerns that the UK will be less attractive as a base for foreign companies, the British government reduced the corporate tax rate from 20% before the Brexit vote to 19% in 2019 and further to 17% in April 2020. Out of the rich and the poor, guess who is going to benefit?
Of course it did. Just as everyone predicted.