All London boroughs are covered by the 90-night rule under the Deregulation Act 2015, but enforcement varies. Boroughs with high housing pressure, such as Westminster, Kensington and Chelsea, Camden and Hackney, tend to monitor short-term letting activity more closely and are more likely to refuse Change of Use applications beyond 90 nights. Hosts in these boroughs should be particularly careful to track their letting nights across all platforms, as councils can investigate complaints from neighbours and issue enforcement notices.