£100 is a great budget for a dash camera, you'll find plenty that have good features and image quality. A Nextbase 412GW is a good buy and available for £100 if you shop around, or you can save a bit of money and go for the very discreet Anker Roav. This has a design that means it can be easily hidden from view. It's around £80, leaving enough money to get it professionally hard-wired. Our list of dash cam best buys is here: www.honestjohn.co.uk/products/top-10s/top-10-best-.../