Canberra, I think you'll find Northolts runway a little too short and yes LHR does have a short runway. If you call 7700 ft short that is! Trouble is its across the two main runways and would not help in increasing the capacity by much. What they are talking about is a new 6000+ ft runway parallel and to the north of the others for short haul routes. This I think would work well along with terminal 5. Would upset the residents a little and be rather expensive I feel with London house prices being what they are, 100 houses to demolish!
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Its dificult to soar with eagles when you work for turkeys!