Thanks for your reply. The glow plug light comes on as normal and after the warm up period 10-15 seconds the lamp goes out, at this point I attempt to start the engine the lamp does not come on again when cranking but the engine does not start.
If I warm up the diesel pump with the hair dryer for 10 mins the Glow plug lamp is illuminated for only a few seconds but the engine will then start, albeit with a lumpy engine rythme
P.S. The glow plugs have twice been replaced. tony