Just 85 per cent of A&E patients were treated at Queen’s and King George Hospital within four hours in September – 10pc less than the national standard.

Barking, Havering and Redbridge University Hospitals NHS Trust, which runs them, has met the target just three times in the 52 months since its introduction.

In an agenda for a board meeting held earlier this month, a “long standing and significant set of underlying challenges” is blamed for its failure to reach the target.

Planned improvements to the service – which include managing staff numbers to reflect demand – are hoped to improve figures by 10pc by the end of the financial year.