Dell Inspiron 15 5000

@ladyxlaurenn  That's not a bad option, and it's a decent price for what it is.  The laptop would likely run Sims 4 on medium graphics, no more.  The integrated graphics chip is good for what it does, but it's not a proper gaming graphics card, and it won't perform like one.  The processor is dual core, so it would be best not to run anything taxing while you play: a browser or music app would be fine, but maybe save editing your screenshots in Photoshop for later.

At current UK prices, an entry-level gaming laptop would probably cost a bit over £600, depending on what is curretnly on sale.  But that's significantly more money, and if you're not interested in spending that much, the Insipiron will perform similarly to other laptops in this price range.