Thankyou everyone for you help . I have also had a very useful PM and will let you know the result . The pedals extend anyway , but are at full extension . It is just the combination of knee up against the very big box on the end of the collective and there is then no room to move the cyclic . Not sure why i have put up with it for so long !! I think rigging will solve it but also IF one was allowed to bend the collective away a bit ( there is plenty of room in the middle ) that would equally sort it .
PPrune can be very useful at times ...Thankyou !!!!!!!!!!