Saw a front page (OK, second page) double sized piece in yesterday's Evening Standard about an expansion idea that instead of creating a third runway would end up "extending" and "splitting" the Northern strip complete with a 650m buffer zone. Never heard this idea being mentioned before. The "brainchild" of a former Concorde pilot aparrently. What are people's thoughts?
You'll find lots of discussion of this proposal in the various threads dealing with airport strategy (including this one).
Search the Airlines, Airports and Routes forum for "Heathrow Hub", or alternatively for "makeweight".