I have another reissue question. Booked an AONE5 GIB-LGW-LHR-BKK-SYD... First international sector is GIB-LGW. Called QF to change the LHR-SYD flight and they said they couldn't as the ticket was issued by BA. I'm sure this ain't right, but it gets better.

Asked BA if I could leave one day earlier, and reroute LHR-SIN-SYD. They said NO changes to first international sector permitted under any circumstances! I'm not rerouting it, just changing it by one day.

Checked other threads and Fewmiles' site (the Star is ambiguous) and told BA: agent said he had got it straight from the horse's mouth. No changes to the first flight. Is this right? Or do I just need to keep trying different OW airlines/agents? The agent also said I could probably do it if I haven't paid for the ticket yet. I told him it would only be a reissue question whether or not I had actually paid for it, after all I can cancel altogether for nothing. Got told no changes again.

Help!