Not sure where you get that from.
No data for the enormously wealthy, but in 2019, £70,000+ households were the least likely to vote Tory.
Of those groups, 40% voted Tory compared to 51% who voted Labour and Lib Dem.
Given the way polls have changed you can probably expect two thirds of wealthiest households to vote either Labour or Lib Dem i guess.
Scroll to the bottom below..
https://en.m.wikipedia.org/wiki/2019_United_Kingdom_general_election