Got a 2005 defender TD5 67000 miles owned for 5 years, been fine spot on couple of months ago fuel pump started making a load of noise had this replaced, since then failed to start any time and temperatures on first key turn always started first turn before. So then had new fuel filter housing still got same problem. Then had injector harness and rocker gasket. Since then if left on a hill for more than 5 mins wont start takes a good 20 turns to start like it is full of air. When it does go it drives a few yards then judders to a stop and then takes a lot to start again but when running spot on and loads of power no bother never misses a beat no miss fire. Then had new one way value to stop diesel going back still no difference anyone got any ideas.

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Sounds like injector seals and washers need replacing, assuming pump is working