Freshly relegated from the Premier League, West Ham United are entering the most crucial summer in their recent history. They will do so with a potentially damaging power vacuum at the top of the club: they have no permanent chief executive, no director of football; in April, Baroness Brady departed as vice-chairwoman; and on Saturday David Sullivan, the co-chairman, resigned too. Sullivan, 77 — who jointly bought a 50 per cent share in West Ham with the late David Gold in 2010 for £50million — is still the biggest shareholder at the club, with 38.8 per cent. He resigned claiming that “serious historic allegations” about him, allegations he “categorically denies”, were about to be made public. He has said that he may sue the BBC, who propose to broadcast the allegations, for defamation. The Czech billionaire Daniel Kretinsky has a 27 per cent stake in the club and could increase his influence and shareholding in the coming months, but for more than 15 years, Sulliv...