Eureka.....got the damn thing to work......I'm not sure quite what the problem was,but I think it was that I still had keys binded to that command,I deleted those and voila,however I also had to re-config my Saitek Throttle Quadrant,but anyway who cares,it works.
It does feel now so much better than using just buttons on my HOTAS to control pitch trim,and the 9 revolutions of control give you very fine tuning indeed,definatley worth the £40,just for the immersion alone