Best non-gaming laptop for the sims 4

NiNi_Awesome08​  I would say it's a good laptop for what you want.  I don't know if I'd go so far as to "highly" recommend it because I haven't tested it myself or heard from anyone who has one.  But Asus makes machines that do what they're supposed to, it has the hardware to be exactly what you want it to be, and it's from a physical store that can provide support or an exchange on the off chance you need it.

Sims 4 itself, all packs included, takes up just under 70 GB at the moment.  User files will need more space too, but saves are relatively small—your whole saves folder could be less than a gigabyte.  Even a 200 GB custom content collection would still fit comfortably on a 500 GB drive, and that's a LOT of cc to manage.  So unless you know you'll want double that, or you're going to store other large files on the computer, you should be fine.

If there is a 1 TB version of this laptop, I didn't see it in this price range.  That doesn't mean it doesn't exist, but often enough, the upgraded version is significantly more expensive than the value of the upgrade.  So I wouldn't be surprised if the only 1 TB model was £200 more.  Or it could be £50 more on another site and I missed it, or that option is sold out or coming soon or only available on a sketchy website I didn't check.

External drives are also relatively cheap—I'm seeing even a few 4 TB options for £100.  While they're not fast, they're fast enough to play back movies without delays, so that would be a good solution for bulk storage.  Unless you know you need to store a lot of files internally all the time (you can't swap back and forth), this is the good budget option for backups and non-gaming-related data.