the sensor was mounting in a stainless steel pipe from the air filter that connects to the throttle plate, and checking the temps of the pipe this was also 50degc.
So i removed the sensor and mounted the sensor in a rubber o-ring washer, the panel mount type where it fits in the hole both sides, as it has a recess in the washer.
Running the car today has the MAT temps down to 26degc, so much better i think.
Another problem sorted if nowt else.
cheers
scott