Looking to upgrade with prebuilt - UK

Hi, im starting to notice that my current PC is beginning to struggle to run newer games so i'm looking to upgrade. My current specs are:

CPU: Ryzen 5 3600

RAM: 16gb

GPU: GTX 1660 Ti

I'm looking for a substatntial upgrade to this with a budget of around £1000-1300 and ideally from a website like Palicomp, where it can be bought on finance. Thank you