Ok... I found the culprit. Never before have I ran into this issue on a car. Evidently brake dust had accumulated on and round the pistons getting inbetween the brake pad and the piston allowing some minor movement on the back of the pad. I'm not sure what type of pads are on the front calipers, as they came on the car when I bought it. Regular washing and cleaning didn't clear this. I had to flush out and really clean the calipers on and around the pistons to get the accumulated dust out. My guess is that it was the sound of the pistons slightly rubbing underpressure due to the brake dust accumulation between the pistons and the backplates of the pads.
Once cleaned the noise has gone away and all seems fine. I didnt get pictures, sorry.
Very odd eh...
