Is it worth reporting a badly driven car?

I keep seeing the same car on my way home, and every time without fail it is bullying people out the outside lane, cutting in the inside to gain a place then moving back out again. Also going way faster than the speed limit. The thing that really bugs me is the "baby on board" sign in the back window!
Is there any point trying to remember the reg and report it?

All I'll say is, if you see an 09 silver Passat estate, with a frosted vinyl Leeds United shield filling the back window, and a "baby on board" swinging thing, then make sure you're not in front of him, as he will try and drive up your exhaust

No probs, I see it fairly regularly so I'll see what I can do.

I love that title, wanton and furious driving. I know I shouldn't.

Funnily enough I haven't seen the car since.