Found the solution to the noise.

Replaced the Pads (mintex1144) with a spare set of EBC Greens i kept in the shed, and noise gone. Think i may have cooked them on track and caused the whole pad material to become hardened and just where the disc kissed the pad when turning was causing the high pitched squeaking

Only got 800 miles out of this set of pads and they are 3/4 worn Who said track days are hard on brakes?

Anyone know what is the maxium temperature for mintex 1144's is ???