West Ham relegation would ‘Hammer’ Londoners with £2.5m stadium bill, reveals Sadiq Khan’s top aide

• West Ham’s relegation would cost London taxpayers £2m to £2.5m a year, as the club’s rent at the London Stadium would be halved and the GLA would face reduced commercial income and higher match-day costs

• The London Stadium already operates at a large deficit, with Londoners subsidising its £19.5m annual running costs under a 99-year “ball and chain” deal signed under Boris Johnson

• Mayoral aides officials warn the financial position could worsen, given additional Championship home games and a lack of progress on naming rights