XXBLG6 is the recent SIII firmware released in UK for Samsung Galaxy S3. major changes include an animation is added to the phone when someone calls, video player can now load the subtitles, and the forward and back buttons are back in the browser


firmware details:
pda: XXBLG6
modem: XXLG6
csc: OXABLG6 (open Europe)


build details:
ro.build.id=IMM76D
ro.build.display.id=IMM76D.I9300XXBLG6
ro.build.version.incremental=I9300XXBLG6
ro.build.version.sdk=15
ro.build.version.codename=REL
ro.build.version.release=4.0.4
ro.build.date=Fri Jul 20 03:44:30 KST 2012
ro.build.PDA=I9300XXBLG6
ro.build.hidden_ver=I9300XXBLG6
ro.build.changelist=928452


download link:
link 1 (unbranded)