I've sorted it now, it was the right hand side blanking plate, got a second hand one and a new rubber for it.
I've set the power valve up as Haynes manual says (all markings line up) it kicks in around 5.5k and stays on the power up to 10.5k. I'm not sure if this is correct but it feels nice and responsive, I don't like taking it up to 10.5k but it's nice to know you have the power and response there to over take a tractor or slow traffic when you need to. Any power valve tips would be appreciated.....