Cheers for all your help.
Dash cam had been working fine, allways backed the videos up to the computer. Watched the odd one every now and again as I did when I bought the camera.
The problem this time was a minor accident that I wanted to review.
Basically had been out for a drive round the country side with a friend averaging 35/40 miles an hour, coming into a small village approx 25mph passing through a slight bend we came accross 4 cyclists the last 2 were side by side. Had slowed to 18mph (dash cam) the guy that was on the right slowed and tucked in behind the lady he was taliking to. We proceeded to pass them when all off a sudden he veered in front of us and ? fell-got knocked over. He then rolled and stood up imediately and picked his bike up.
He came to the passenger window at which point we asked if he was ok, I think my friend was in shock at this point. The guy then said it's not the 1st time he had done that and said he had hit a pot hole.
My reason for slowing down the fast video was simply to view the road and accertain what had actually happened, my old camera (Trancend 220) would not have showed the speed and GPS in the event of this being a serious accident. No pot hole that we could see on the Dashcam, think he simply slowed too much and turned the front wheel in an effort to balance the bike which caused him to fall and roll away. My car sustained a small scrape on the front of the bumper where we think the pedal caught it.
Really glad I had got the extra information on the dashcam, had the guy have been injured I was it would have have been there as prove, The lesson i learned, things can change in an eye blink and having the Dashcam is as good if not better than having an insurance black box in the car.