here's a question from an uneducated american.
Why does EGLL have so many a/c holdings at the various HPs every morning and every afternoon?
Why can't the various center controllers sequence the traffic destined to EGLL with a good in-trail of 20NM then have the mid center sectors leading to the London LTMA reduce that to 10NM...? I know we do it here in the states alot and it seems like that's always never a problem. A lil delay vector here and there and everybody is sequenced with the correct in trail.
I'm just looking for an explanation, as I realize you guys have probably thought of that way before i was born and figured out it didn't work for one reason or another. I'm cruious why and what makes the TMA there such a complex airspace.