Hi Jhiemingha,
(Sorry to be responsible for this thread-drift, chaps!) We've been here before:
http://www.pprune.org/aviation-histo...ml#post6715449
As you know well there are three factors here, all of which were definitely present on the 1103s, (e.g., the Brooklands a/c):
(1) chord extension inboard (so the L/E has a mid-span kink);
(2) Kuchemann tip (as you said, this seems to refer to the shape visible in the plan view, not the "droop-snoot";
(3) the "droop-snoot".
Having flown G-ARTA in 1109 config with BUA/BCAL, I'm absolutely sure it had (1) and (2), not least because she was FL430 capable and we used the same cruise-performance charts as the three 1103s, proving the buffet margins were the same. What I cannot confirm is that she had (3), because I simply can't remember (and the F/Es did the walkrounds). I wonder what effect(s) the droop-snoot had on performance. Pity that photo is in silhouette... I cannot disagree with anything vc10617 says.