160kts to 4 miles is almost impossible in the 757 when operating at shuttle weights. Factor in the anti-ice and the inevitable tailwind on base/finals whne landing on 09L then it becomes a real challenge to even get the aircraft stable.
120.4 i understand your frustrations but my priorities lie firmly in keeping the aircraft safe and getting it established and stable on the approach for what i
(and my company SOP (BA))consider to be in an appropraite position to continue to a landing. This inviarably involves reducing below 160kts at 5 miles ish. LHR runway capacity doesn't even figure in my thought process. Although, i might add i will do my best to avoid sending anyone around..which i haven't in 10 years of flying at LHR.
My company SOP states that we should be stable at 1000'ATRE and must be stable by 500'ARTE. The final flap and speed reduction must be taken at 1500'ARTE. This is quite plainly at odds with what you ask.
FWIW 160kts to 4 miles is easier in the 767 as you obviously haven't got as much speed to lose.