Originally Posted by
pazza2000
Once the 241 has expired (in my case July), I believe the inbound can't be changed although I'll happily be corrected if that's not case

Ah, I was responding to the suggestion that you couldn't change the return after the outbound had been flown (which is incorrect). Afraid I don't know about the 2-4-1 expiry.
Also Singapore is out - the AUH-SIN leg is longer than the LHR-AUH one.