This one's been floating about for ages. There's been a facebook group promoting the idea for long enough to get over 250,000 members
http://www.facebook.com/group.php?gid=2208998433
Also worth signing this one too while you're at it
http://petitions.pm.gov.uk/Keep-left-signs/
Edmund King, executive director of the RAC Foundation (2004):
"The middle-lane hog and outside lane blocker are selfish drivers who are wasting one third of our motorway capacity. If we can encourage these drivers to practice better lane discipline it would be equivalent to adding 700 miles of new motorway capacity.
"Poor lane discipline wastes the scarce resource of road capacity, encourages road rage and leads to dangerous tailgating.
"It takes more than ten years to build an extra motorway lane. We could in effect add an extra 700 miles of motorway overnight if motorists improved their lane discipline.
"We would like to see more traffic police on motorways pulling drivers over for hogging the middle lane."