BA 15/16 becomes B744
 

From what i notice, BA 15 has changed back to 744 operation from 25/10/2009 till 01/03/2010. (03/11 to 27/11, 2/3 to 29/03 has no BA 15 service). More chances for One World i guess. 777 operation resumes on 30/03.

That's correct Benny.

Today BA15 is G-CIVK, BA9 is G-CIVE.

From what i understand the BA11 which is the terminating LHR-Singapore service does not operate during the period the BA15 does. This is a reduction in the London -Singapore service for the Northen Hemisphere winter period , hence why a 744 is back on the Sydney service.

From the photos that appear on Radarbox, both todays' BA 747's were "OneWorld".

Sorry, looking at wrong photo; G-CIVK was in 'OneWorld' scheme.

Excellent!
By the way, is there way of knowing beforehand when a 'One World' jumbo is going to fly in?

There's a website I use called www.acarsd.org - you can put in regos and see what flight that aircraft is doing. This will give you about a day's notice for flights from LHR.

Thank you so much! I'll have fun with this!
[By the way, I love your photos!]