She lives!
I had her in the garage, (in a semi-dismantled state, with wires not routed right after testing etc).
I did a couple of tests to make sure that the relay was at fault, and it was (there's a noticable click when the ignition is turned on, but not with the old one).
After working the fuel through she started to bumble into life (rather smokely, I assume this is because it's been sitting for a few months). Once it was idleing ok (still with some choke) I turned her off. Put the spare CDI in (one I bought that turned out not to be the problem) to check that it did actually work, and it still started so turned it off and connected my old CDI back up.
Then I put it all back as it should be, bolted everything back together, and rolled her out of the garage.
Tried to start her again and she WOULD NOT! Grrr!
So after trying for a while, I decided to take the tank back off, and a sparky out. Oh look, I don't have a spark again!
Switched the CDI's (spare on now in the bike) and she sparked again.
Put it all back together, again, and she started again.
Went for a lil ride and all was good. Was going gentle on her but she still goes well!
It would appear that my CDI had just died then? But it was definitely the relay at fault.
Chris: You posted that as I was typing mine. But thanks for those anyway
Cheers for all your help guys!