@1CordeliaRose1 I checked a few different U.K. sites, and the prebuilt computer you're looking for really isn't out there right now. There are cheaper options that wouldn't run TS4 very well, and some very nice models that probably cost more than you want to spend. So I think you'd have better luck customizing your own and having it built for you. Or rather, I could customize the system, making sure it had everything you wanted, and send you the link.
For example, I poked around a couple of custom build sites and put together a system that would cost exactly £600, including VAT. The site is CyberpowerPC UK; the American version of the company has a very good reputation. The computer's specs:
- AMD Ryzen 5 2400G
- 8 GB RAM (1x8, so you could add more later)
- AMD Radeon RX 560 graphics card
- 1 TB Seagate FireCuda SSHD (hybrid hard drive—just a bit slower than a solid state drive)
- Corsair 650W 80+ Bronze power supply
This particular configuration would run TS4 very well. I could adjust the specs a bit, adding more RAM or storage (i.e. the hard drive), swapping out a better graphics card, etc. if you want, or I could look for other models. This will depend on how much you're willing to spend. For example, the first thing I'd do if you had the money is upgrade the graphics card to an AMD RX 580, for an extra £43. But it's not strictly necessary; I know someone who runs TS4 on a Pro 560 (a bit weaker than the RX 560) on high settings. The better card is more for futureproofing.
If you have any questions, please feel free to ask. One question you should look into is if CyberpowerPC or Overclockers UK offers student discounts. (The Overclockers configurations I liked started around £650, which is why I wound up at Cyberpower.) If so, let me know, and I can upgrade the parts a bit. Here are the sites:
https://www.cyberpowersystem.co.uk/
https://www.overclockers.co.uk/