Right,

this rubbing/ humming noise is still annoying me!

I rolled down a slight incline and put the handbrake on one click, the noise did alter but did not stop, the car was able to roll relatively freely so im not sure that the handbrake is too tight. Coincidently it takes about 2 clicks to apply the hand brake fully, 3 clicks at a push but dont want to stretch the cable.

ITs difficult to tell if its side specific, i just know its rear wheels/ brakes, again the inner surface of the drivers rear brake disc seems to have alot of carbon deposit even after driving?