A number of bus routes operated by subsidiaries of Régie Autonome des
Transports Parisiens will be on strike on Monday, with some continuing for
another two days:

https://www.mylondon.news/news/zone-1-news/london-bus-drivers-strike-month-19803286

https://tfl.gov.uk/campaign/bus-strike?cid=bus-strike#on-this-page-4