Update everybody

Fitted a new Clutch Switch and Glow Plugs, unfortunately no difference at all, after driving around for a hour Saturday (losing power a lot) the Engine Management came on again however as I was driving it to the garage Monday the light went out, the mechanic said the fault wouldn't be saved if the light has gone out, I watched a video on you tube of a guy testing the EGR valve were he took the motor off and opened and closed the valve with long nose pliers, so I did this to mine and the valve moved smooth and freely, stated the car with motor off and valve open which made the same problem I am getting, locked the valve closed and the engine revved up as normal, I noticed the half moon arm on the inside of the motor housing moving up and down all by its self so I think the motor is to blame, put it back together with the motor disconnected problem solved engine runs fine, new motor is on its way!