These 'Rebel Rider' cyclists were pictured on their way to London via Marlhill Copse for April 15's 'This is an Emergency' demonstration in Marble Arch and the 'Extinction March' from Parliament Square.
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Tree work by the airport at the Copse has reportedly been halted, for the time being, following a legal intervention by a local resident. You can see a That's Solent interview with riders on Facebook, and coverage of the London Extinction Rebellion protests on some national sites, including here and here.