I would always prefer 50 pounds discount against 200 pounds cashback, or a thousand you can say.
You have to put total cost before cashback, as cashback isn't always guaranteed. Good deal for those with a good memory, unlike myself, who would miss the deadline to get the cashback (fierce)
Not sure why the total cost is listed as £1,080 and I am not sure how to edit. But total cost comes to £864. Throw in Spotify Premium for 2 years and that effectively saves you another £240 (I have a subscription with them so makes sense for me)