Ah UK. That makes a little more sense then ^^. We are closer geographically after all.I'm UK actually! There are a few of us knocking about, a few Australians too!
Yes absolutely you'll be good.
And to clarify, would a new GPU have worked with your current PSU? Yes.
But would it be a safe idea? Not really. and that's the basis of it, which unfortunately not everyone believes!
That and if you go one of the ones I recommended like the RM, FOCUS Plus etc, you're guaranteeing yourself for 10 years! I currently use the Seasonic FOCUS Plus Gold.
And it is better to be safe than sorry. I saw that 10 year guaranty too on amazon and that is a really big argument for switching out the PSU. Thank you so much for your enormous and quick help. My question was definitely answered .