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Rocky 2 buckets

Has anyone used/using a Dashcam, for insurance purposes or the like?. I have researched them and found the really 'good' ones to be up to £200. Is it worth it, is it admissible as evidence?. I had a few Roe Deer run across the road in front of me this am,
missed them by 6', close call. Got me thinking about the Dashcam idea. All input gratefully received