Spent this afternoon trying to get this sorted with no luck Tried Jon's suggestions and in my garage with the engine off, it seems to be engaging 5th gear. As soon as I take it out for a test drive and try to get 5th I can move the gear stick to the right but as soon as I try to move it up, it will not budge. With the engine off, it will move to the right and up, without the same resistance.
So tomorrow I'm going to be phoning around to see if I can get a speacilist to sort it for me.
If it comes to it which I hope it doesn't, so I can go to the factory visit. Apart from the obvious of the engine revving higher and using more fuel etc, will I run the risk of damaging the gear box\engine if drive the car at speeds when it should really be 5th e.g. above 40MPH for long periods of time?