Engine turns over but won't start after jet wash

HELP I bought the wife a disco series 2 diesel 2.5 tdi we took it for a jet was after a bit of off roading and the bugger won't start it tuns over but won't kick into life. We had to be taken home by Green Flag (nice guys) and even they where stumpt . So has anyone got any ideas please so I can get out of her bad books lol.

Sounds like electrics, possibly affecting the glow plugs. You are in a sub group for Series Landy's i.e. Series 1,2 & 3 not Disco's. Suggest you re-direct this into the Disco part of the zone. Water n electrics are bad combination. Is it blowing white exhaust fumes?