UK cancelled flight: when might compensation be due?

CAA guidance says fixed-sum compensation may be due for some cancellations where the passenger received less than 14 days notice, depending on the cause of cancellation and the timing of any replacement flight. Extraordinary circumstances can remove the compensation entitlement even though refund or rerouting rights may still apply. Official source: UK Civil Aviation Authority. Guide: https://getinstantlaw.com/travel-disputes