Witness to Dangerous Driving - what should you do?

[goodlife]

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This morning I saw the most horrific dangerous rush-hour driving. Man in Focus is 'racing' man in Golf down the A308 around Windsor.

This is a very busy two-way road, and these guys were overtaking like lunatics, forcing oncoming traffic off the road. In the 3 minutes I witnessed this stuff, they almost hit each other twice (inches apart), and almost caused a pile-up on the other side of the road (smoke from tyres as oncomings cars locked up trying to avoid rear-ending each other)

As a good citizen, what should you do in this situation? Dial 999? Take their registrations and report it later?

Anyone taken action in similar situations?