Please report dangerous drivers to the police - Roadsafe. Report to plod, not just whinge here.

First time I've tried The cameras at all and can't look at it at work... I think they both ( I've got one on the back too) keep turning themselves off at random intervals ( in testing last night it was only one, videos lasted 46 seconds and 1.13 respectively)?!?! On the bike the lights keep turning off, why!?

Wicksie is right. It sounds like the sound mode. If you use this (by pressing the mode key once) then it only comes on at certain sound levels. That said a commute along busy roads (or even quiet ones) means that it will be pretty much on all the time. I did this on my first commute and came in to find 15 different videos it seemed that when I stopped it stopped.
Now I make certain not to touch that button.

There are other possibilities also
1) poor charging. The cables they send and the plug afdapter are crap. Use your own usb cable and it charges brilliantly.

I don't know if battery memory is a problem but fully charging them initially is really important. Not sure how to overcome that if that is the problem.

2) you've got a dodgy one that has a fault. Try it a few times and if it doesn't work contact the seller - I had a prob with one and got a speedy refund.

3) your micro sd card. Not experienced it myself but when researching these I saw a posrt elsewhere about using cheap cards. Sometimes they can't handle the volume of data so stutter or switch off.