Download the Amazon Prime video app on your device and then launch the app to sign in with your Amazon account in the UK. As a result, you will get the activation code of your device. This activation code needs to be entered at amazon.co.uk/mytv and then you will be able to access Prime video on your device. You must have an Amazon Prime UK membership to watch your favorite Prime Video content on your device. Follow the activation process to watch Prime videos in the UK via amazon.co.uk/mytv.