The Car is Sorted!!
Got a bit fed up with it and lots of "experts" who should know better telling me it was anything from the wrong throttle body to a screwed ecu.
Turned out to be the 4 wires from the lambda plug in.
Thats the plug into the car,not the wires on the lambda sensor.
So,if you have issues with your Mk3 failing on high lambda readings,get those wires checked before you replace a thing.
You,ll save yourself a fortune.
RALPH