Opinions on my Budget Gaming PC?

For games like Fortnite you shouldn't have any problems, but I'm not so sure about GTA V. You may be able to run it at low settings though, but min. requirement is a quad core CPU and the one in your build is only a dual core.
 
That's better but be aware that Ryzen depends a lot on RAM speed. At least get a dual channel kit with 2x4 GB but also spend those few quids more and get RAM at 3000MHz or 3200MHz.
Also make sure the RAM is on the mobo QVL list. Those 1st gen Ryzen systems are very RAM picky.
 
Thanks for your reply. If you don’t mind, could you possibly link one that you’d recommend? My max budget is around £450-460 so anything that’s within my budget would be much appreciated. Thanks!