Normally Sky Q would cost you £34 a month, and if you wanted to add Netflix on top of it you'd have to pay up an extra £10-£12 depending on which Netflix plan you wanted to get. But now, for a limited time Sky is offering the two for just £25 a month.
The deal is an 18 month contract that includes both Sky Entertainment and the standard HD Netflix plan on a Sky Q box. So you're getting both for less than it would normally costs to just get the Sky part. Which is good if you want Sky, and are sick of Netflix cancelling all the good shows.
It doesn't matter if you already have Netflix either, and activating it will let you merge the cost of Netflix into your standard Sky bill.
The only catches to this are that you need to pay an extra £20 setup fee, and if you cancel your contract at any point you'll have to return the Sky Q box.
The deal is live now, though, and you can head over to Sky's website and sign up right now. If you're already a Sky customer it's not clear whether you can take advantage of this, so I'd give customer service a ring and ask nicely.