The bitter family feud over the billionaire Barclay brothers’ business empire remains headed for the high court in April, even as the once tight-knit family comes to grips with the death of Sir David, who together with his twin brother Sir Frederick, amassed a £7bn fortune building the family firm.

Last February, Frederick, 86, and his daughter Amanda, 42, launched a legal action against David’s sons – Aidan, Howard and Alistair – and Aidan’s son Andrew, after they were accused of secretly recording 1,000 conversations Frederick held in the conservatory of the family-owned Ritz hotel in London.