Yep, bit complicated.
Take out the Nowtv trial - a card will be required - but cancel the trial as soon as you have tested that it works. (The trial will still run the whole 14 days.)
When you apply future offers/vouchers you must write in your diary when the offer/voucher ends otherwise Sky will charge you AFTER the offer/voucher expires. This is how they make money. Or simply cancel a voucher/offer as soon as its working. (Not sure about this but if you apply any voucher before the end of the trial period it may become active immediately rather than starting from the end of the trial period - minor issue.)

The Chromecast bit. If you don't know, this box lets you watch various "content" on your TV using your smart phone as a remote control. EG. Google Play Movies, BT Sports App, iPlayer, 5OD, Channel4 etc and also there's a NowTV app. This means you can throw your NowTV box away. (Unless you value the ethernet connection - the Chromecast is only wifi.)

The offer. To get this offer (2 Months Sky/NowTv Movies for £2) you need to have your Chromecast plugged in and working.
Then click on the above link from your controlling smartphone :- https://www.google.com/chromecast/redeem/
This should open the Google Home app and allow you to get a NOWTV voucher code (amongst other offers - see screenshots in above post) which you then plug into https://account.nowtv.com/passes at any time before 31 December 2016.

Or something like that.

Is this because you are charged £1 per month, so they take £1 when you buy the pass, and another £1 for the following month 30 days later.

Don't cancel it now. Cancel it at the beginning of 2nd month.
See Comment #44 by frizzyhead above.

Fantastic, thanks :smiley:

great timing! my current 2 months for £2 offer runs out xmas eve, that will keep my nephews quiet over xmas hols. thanks for posting, I don't always use my chromecast so don't always notice the offers

Thanks

Do I need the nowtv app installed to have the offer appear on Google home? I only have one offer and it's for Google play music.

These are the 4 offers I see

:smiley: great

i have a movie pass currently, will this stack?

thanks.