They make the strangest bedfellows – financiers such as Sir Michael Hintze, one of the world’s smartest hedge fund managers who gives as much to the Conservatives as Unite does to Labour, Alexander Hoare, managing partner of the world’s oldest family bank, new kids on the block such as stockbroker Oliver Hemsley of Numis Securities and maverick economists such as Roger Bootle.

Others are Tory donor Henry Angest, boss of Arbuthnot Banking Group, and Stanislas Yassukovich, the former head of Merrill Lynch; more old money with Rupert Hambro of the eponymous investment firm and new money with Robert Hiscox of Hiscox Insurance and Julie Meyer of Ariadne Capital.