The procedure on the -400 at BA falls into one of 2 categories:
1. Ex LHR and certain other stations as notified on passing 1000ft agl we accelerate to Flap 10 speed and then select Flap 10 and full climb power. We maintain this config and speed until a specified altitude (4000 ft at LHR) at which point we continue the clean up as normal. When clean we usually select CLB 1.
2. An non-notified stations, at 1000ft agl we commence an acceleration to clean, taking flaps on schedule, with Climb power (usually CLB 1) being scheduled on achieving Flaps 5.
HTH - can't comment on YSSY as haven't been there for ages
