For months there's been a "free month" of Prime offer showing up on the Amazon app of my NowTV Smart Box. Recently I decided to take it up, so clicked it. Everything seemed ok but then I discoved Amazon had billed me. I took it up over their chat and they refused a refund saying I'd had a recent previous offer according to their systems - I have not. They also said they cannot refund because I have used the Prime. I had to escalate the chat from adviser to specialist to manager before they backed down and agreed a refund. The point is it's a free offer that I took in good faith. It may be the same with a normal Roku - I don't know.
So this is just a heads up to beware if you take the free one month Amazon offer - you may get charged and you may encounter resistance to getting your money back.
This is no reflection on Sky or NowTV - Amazon were the problem.
