The BUA standards inc. GARTA got the same treatment, Chord increase. BOAC/BA/Gulf/RAF K.2 did not.
I just found a picture of Duxford's BOAC Super 'SGC on the Brit modeller walk 'round pages for the 'Ten I zoomed it 400% and it shows the same slat kink. Its not a great picture but from the highlight running the L/edge. Also slat T/edge you see the change in angle.
Jelle check your inbox!
Vickers VC-10 - Jet & Rocket engined Aircraft - Britmodeller.com