I had the same problem on a 53 Plate Trafic Diesel , Good runner normally , went to go out one Morning , Tried to start it , Nothing , turned over , plenty of oomph in the Battery etc , but not a sign of firing up , Got the Rac out to put their lappy on , But they could`nt tace it , so they towed me to a Local Indpendant Renault Garage
Problem was found - there`s a sensor on the Crankshaft and Camshaft when one or both go down (open Circuit?) , they stop a message going from the ECU to the Pump , When working they sense that the Engine is turning over and the ECU sends a message to the Pump to send Fuel to the injectors and then the Motor "should" fire up !
Progress eh ???
Cost was about £50 for the Diagnostics then about 50 or 60 for each sensor (fitted)
Lucky