Originally Posted by cauchy

Few points:

(1) If your fare rules allow a change, e.g. for £50, then you can change to any other BA ticket, as previously advised. You need to call to change destination.

(2) You need to take the first flight within a year of you buying the ticket. So if you bought the ticket in August 2023, Paphos in September 2024 isn't possible.

(3) Subsequent flights need to be taken within a year of the first flight.

So you could get around the ticket validity dates by e.g. change to EDI-LHR in say May 2024, stopover in London until September 2024, then fly LGW-PFO in September, returning PFO-LGW a week later. All 3 segments on the ticket.