Well it was XFX which is supposed to be Seasonic so I'm not exactly blown away.
I am unemployed but got my universal credit payment today and have ordered a Corsair TX650m.
Hopefully it will be here by Thursday, if it still restarts after that then I will be horrified.
One thing I've noticed recently is that when gaming the graphics card fan can't seem to get a moderate speed.
It starts trying to spin up but can't, until it eventually gives up and goes to high RPM.
So I'm hoping it's not a GPU fault.
But then performance in game is fine until the moment the system restarts. If the GPU was overheating or failing on a hardware level I'd expect a lack of performance and artifacts on screen.