frequentflyer2
My understanding (and some experience) is that both options are possible.
BUT and it is a big BUT, you have to make such changes via Customer Services. It would be quite so bad if they would allow you to change both sectors of a return, but they don't. My advice is not to make any alteration to the disrupted booking online if a re-route would suit you better. If your booking is still in its "disrupted" state then the call-centre staff appear to have less difficulty in sorting it for you.
Anyway, doesn't alter that fact that what they are doing is quite unacceptable. It will cost them considerable goodwill and passengers.
