It's 5 years since the 2021 flash floods that affected 24 boroughs and over 2,000 properties, including homes, schools, hospitals, and Underground stations.
Source
https://www.gov.uk/government/news/5-years-on-londoners-remember-the-impact-of-july-2021-floodsDocument officiel chez le régulateur. Citez toujours cette URL — et non la page de détail Vantage — dans les preuves de conformité.