Netflix Premium
Netflix Premium is their top tier, allowing Netflix to be viewed on up to 4 devices concurrently and in 4K UHD & Dolby Atmos, all without ads.
If you're on Sky Stream or Sky Glass, you can use the MySky app to downgrade to the inclusive/£0 per month Standard with Ads tier or the £6 per month Standard tier without ads.
If you're on Sky Q, I'm not sure if the MySky app will allow you to adjust Netflix tiers or whether you'd need to call Sky instead.