Thanks again
Stuff I have tried so far
Checking for play in headset
Any loose bolts, lowers or 24mm tops on both damping and spring side
No fork oil leaking
All works fine except for this little bit of play indirection of travel
Think I am going to ring SRAM and try to get a decent drawing and of course when I get time take the lowers off and have a look
I am starting to think that it night be a damper problem?
bugger