I'm over the cold I've had and the PSU in my computer has been replaced.
I was all ready to travel to Sydney today but I googled for local stores in a last ditch attempt to find someone closer yesterday and found a company that actually was on my route home.
I'd never seen them or heard of them before but I gave them a ring and they recommended a course of action that meant taking my PC to them. Now I've always built my PC's and this was quite a thing to be asked but I did it and forty minutes later I had a new PSU and a working computer.
Nothing else was damage (fortunately) and I'm back up and running.
Posts shall resume henceforth!