DANNYB111

How is the refund amount of a multi-leg itinerary calculated when only one leg of that itinerary is cancelled?

Original ticket was DUS-LHR-HND//CTU-LHR/LCY-FLR, where the outbound to Haneda was in December and the return from Chengdu in January. All in CE/CW, cost of around £1,400.

The ticket was then changed to LHR-NRT//CTU-LHR/LCY-FLR in December when DUS-LHR was cancelled due to fog [no charge made by BA].

Pax ended up flying LHR-NRT//CTU-LHR, then were notified on the ground that LCY-FLR were cancelled.

My understanding is they are covered for a partial refund under EU261, but not clear on how much this would be. I assume it would be the LCY airport fee (not sure how much this is for BA in CE), possibly some APD (though not sure if that's payable given they were transiting CTU-FLR via LCY) and a fare component (but obviously relatively little of the overall fare would be going to LCY-FLR vs. the long haul components).

Would be good to get some thoughts!