lucasa_ For London Control purposes I would say to the ILS of the active runway. If EGLL is on Westerlies, WU is on 25.
If LL is on Easterlies, WU 07.
From LAM/BNN IntN vectors it straight to final. As Int S from BIG/OCK I would aim cross it between 4-7nm final of EGLL at 4000 and hand off to FIN. Then FIN vectors it to Final at WU.
Hope this is any use.
Cheers, C
