Recommendations for dash cams?

Looking for a dash cam, ideally front and back cameras. I've looked at the Innov K2 but at the £300 price, it's too expensive for me.I used to use a go pro on my helmet, but with anything over 90 minutes, battery dies and becomes useless.I'd like one, at around £100-£200 mark, with it starting to record when it gets power going to it, rather than me turning on the recording. via /r/motorcycles https://www.reddit.com/r/motorcycles/comments/acxcqe/recommendations_for_dash_cams/?utm_source=ifttt