I can now confirm its all working as it should (for now )
The flap lever goes back at it should at 5k revs and theres a slight change in engine note ....so i think its alwys been working fine but removing the imrc and taking off the backplate and a swill with some wd40 seems to have done the trick.....i must say though im more convinced that my squirt of wd40 (a wd40 lid full) down into the throttle chamber must have created a nice mist of lubricating wd40 when the engine started up and probably prevented any scoring or friction on the flap mechanism where the eye cant see and the manifold seems to stick less when hand operated