MEL,
Couldn't tell you why LON VOR and not the ILS, I'm afraid.
Report on an incident near London Heathrow Airport on 27 August 1997 - AIRPROX (C) : Boeing 737-200 and Boeing 757
The above I think is the most recent incident and the one that was the driving force in getting the missed approaches changed from "SAH to 3,000ft then as directed by ATC" to the current ones, which are.....
27L Climb to 2000ft - straight ahead until passing 1076 (1000)ft or Zero DME I-LL
inbound, whichever is later, then left onto track 150°MAG. When established and
passing 6 DME LON, climb to 3000ft without delay. Continue as directed by ATC.
09R Climb straight to 3000ft
Continue as directed by ATC.
27R Climb to 3000ft - straight ahead until passing 1577 (1500)ft or Zero DME I-RR
inbound, whichever is later, turn right onto track 320° MAG. Continue as directed by
ATC.
09L Climb to 3000ft - straight ahead until passing 1580 (1500)ft or Zero DME I-AA
inbound, whichever is later, then left onto track 040°MAG. Continue as directed by ATC.
23 Climb to 2000ft - straight ahead from Mapt (RTR 2nm) until passing 1076 (1000)ft or
Zero DME H-TT inbound, whichever is later, then left onto track 180°MAG. When
established and passing 6 DME LON, climb to 3000ft without delay. Continue as
directed by ATC.
I understand they were test flown in the sim by BAW and given the okay by them.
WF.