Eventually, Mat at Techmoan tried this one from China;
http://www.techmoan.com/blog/2013/8/31/ ... creen.html
It looks like many other cameras out there but as Mat has tested many car cameras over the years and this is the first one he's happy to keep in his cars then that was a good enough endorsement for me.
Once it arrived from China it didn't take very long to fit it;
I've stuck the sticky pad beside the rear view mirror with the usb cable running up to the roof lining and down the A pillar, and with the mirror in place it's invisible both inside and out. I initially tried it in the 12v socket but of course it would always be on so I bought a 12v extension, cut the socket end off and spliced it into the ignition accessories so it comes on and goes off with the ignition (It does have motion detection for when you're parked up if you have it permanently powered).
It does come with software for playback and gps analysis but I prefer to use RegistratorViewer which you may have to also download the basic K-Lite codec pack to assist playback.