I'm probably gonna get some slack for this deal because its not building your own, but for £629 you can't really go wrong with an entry level gaming PC.
The SSD is a real nice bonus for this price range. 2 Year guarantee included too.
I'm thinking strip out the 380 and install either a 1060 or 1070? Wouldn't be that much more if you sell the 380, plus a PSU of 500W should handle it. Doing this would set up a sweet VR or 1440p machine.