Ok, this sound is only audible with the passenger window down, the radio off, and if you lean forward and squint. So in other words not very loud, but still just a bit concerning. Ill grab the WD40 and see if i can see anything under the bonnet. I do remember when my air-con belt started to die it started to make a pretty horrible sound, it eventually snapped before i could located what was makeing the noise. I havent changed the other 2 belts yet, but the timeing belt was done only 10,000km ago.
Just one of those annoying little noises..
Cheers.