Originally Posted by
Stez
Not sure how easy it is to get BA to switch you onto the BA12 as that depends on your tickets etc. Practically, it's pretty easy to do the actual transfer between the two flights in SIN, they are typically within a few "C" named gates of each other and luggage won't be a problem either.
Quite a few FTers do this to earn extra TPs as it is treated as two flights between SYD and LHR rather than just one if you flew on BA16 all the way.
It would be my preference to do it that way too as the A380 is a better plan to fly in and it gives you that bit little bit more time to relax in SIN - the difference between walking around and dashing to/from the lounges.
I hope the OP is planning to purchase tickets with the connection at SIN to the other flight number and other aircraft type, not just ask at the airport. In that case, it wouldn't be a matter of needing "to get BA to switch" oneself.