The upward trend, which has been rising steadily since August, has been driven by cases among young people, according to the data. The rise has added to the strain on the NHS in the capital. There were around 433,000 A&E attendances in London in September, a rise of almost 24,500 on August, and 129,900 ambulance incidents, up around 730 on the previous month.
Professor Frankie Swords, NHS national medical director, told a briefing: "From an NHS perspective, it is very early in the season, but the number of admissions for flu are the highest that I can remember seeing at this time of year, and it's coincided with just the start of the expected increase in Covid cases in our hospitals. But this is coming on the back of the busiest summer we've ever had in our emergency departments, we have got very, very busy hospitals. So slightly ominous early signs of winter pressure."
Dr Jamie Lopez Bernal, consultant epidemiologist at the UKHSA, urged people to come forward for protection without delay. He warned that flu levels are increasing with the possibility of an early flu season. Londoners are being advised to get their jabs.