I would appreciate any advice regarding transferring flights at KUL. I am arriving on BA and departing on MH to BKK. Despite being Oneworld partners BA say they cannot guarantee my luggage can be checked through to BKK. Both airlines operate from the main M terminal but does anyone know if I can simply collect my luggage and go to a transfer desk or would I need to exit through customs and then check in again with MH? I am travelling in F with BA and J with MH. In response to the inevitable question I want to try BA F in the new 787-9!