Its the back wheel, possibly sounds like its located within the bearing area of the rear wheel... Few notes: When using the quick release, the rod came out, as I must have undone it too much. So the springs came out, which i have relpaced, however as the springs have a 'cone' shape, should the larger end be facing outwards, or inwards. They are currently facing outwards. Also, could some fine grit be on this rod be causing the noise?

The sound is more of a harsh sound, and doesn't really sound metallic like gear rub at the front etc, almost a 'ticking' grind sound, but not a generic tick.
I'll re seat the tire and tube if the problem is still around tonite or something.

Also just noticed that all of the rear cogs move together (don't know the precise terminology) , waving around abit, like a slightly buckled wheel. The wheel is not 100% trued, so i pressume that is why, but it could still be an issue.
Thanks,
David