Sign up at nowtv.com/xbox10. Rember to cancel renewal if don't wanna be charged new customers only code sent after 30 day trial
Good deal, i got the MS points from this earlier in the year. Probably not worth risking it again if its new customers only.
You would need to contact NOWTV for them to remove your NOWTV Account from the console it's registered to and then you'd be able to do the rest. IMO it's just not worth it. They sent me a deal of 4 months for £1 each so I signed up for it and so there's always some films I can watch without the need to download any.