Need a £400 gaming rig.

I had a call from a good friend not so long ago, his friend has been let down on a purchase for hid son and has come to me for help, I’ve nit got access to my rig until later which makes searching, like a snails pace on my mobile. I’ve seen ebuyer have some prebuilt rigs for around that price with a nVidia 1050 gpu and an AMD A8 I think it was, it’s not bad but can you help me with something a little better?

Take a look at some of the builds on PCPartPicker, they have some completed ones and you can filter by price:

In general, I find the pre-builts to be more expensive than if you build one yourself (which makes sense).