How to educate middle lane hoggers.

One of my pet peeves (as I am sure it is for most of you) is when people hog middle and outside lanes on the motorway.

I spend a lot of time going up and down various motorways for work and cannot seem to shake the irrational anger this gives me every time.

Some people flash, some people undertake and get their attention, some people beep.

Is any of this really the right thing to do?

What is the most rational and effective way of dealing with these painstakingly, irritating collection of atoms?