Air Traffic Control in LHR is going to start testing out a new system that utilizes time based spacing instead of distance for arriving flights. This is supposed to help them alleviate delays and capacity issues on windy days there.
This will however cause separation distances to drop between aircraft from the traditional wake turbulence separation distances. Not sure how I feel about that part, but the article does say they've conducted a whole bunch of tests with lasers and other readings to determine it would be safe.
Thoughts avgeeks?
http://www.bbc.com/news/magazine-31109732