Dispatch Van 2.0 Hdi 2004

[Taichibob]

Have owned the dispatch for 4 years. Not a problemm 170,000 miles,just he norm service ,tyres etc.
Just after the down pour it would not start. Then 2 days later it started ran ok, tried on the next morning but on he evening nothing no ecu light , glow plugs but it will turn over..Any clues where to start
Thanks