Driving instructor?
Good deals on Cycliq products at present, and your police force have an online reporting system where you can share private(?) YouTube links. Also, if you know you are being recorded, you might moderate your behaviour, not that I think you were being unruly.
I suggest this as, other than stew, there is nothing really positive you can really get from the experience. And who doesn't like buying gadgets?
I've had a look at the Cycliq stuff, and they seem very bulky to me to be honest, plus I already use a dynamo lights setup. I do use a barfly computer mount, which has a gopro mount underneath...
In all honesty though, 99.999% of drivers are fine, and on the odd occasion I do feel the need to stop and speak to a driver, they usually apologise when I explain that they were too close, and that's it. You can't plan your life around dealing with tossers, you'll go mad.
But then, more gadgets!