Hi, got a 1.6 diesel on a 57 plate. The engine turns over and starts as usual when the engine is cold but after a journey and once the engine is up to running temperature, if you stop the engine and then try to restart it 50% of the time it will not turn over. If you try to start it 3,4, or 5 times eventually it will turn over as normal and start. Also if you let the engine cool down it starts as normal. Battery was tested and was ok. When it doesn't start there is an audible, single click or knock, not very loud but it is there. When it happens it is just like trying to turn an engine over where the battery has gone almost totally flat and the starter will not spin. I took it to the garage and at first he said it was the battery but on testing this was not the case. For some reason the mechanic at the garage said he thinks its the starter but is not prepared to change it until the car won't start at all and they can diagnose it ? Only problem is that we now have a car we can not rely on. Can any one throw any light on the matter as using the car until it fails altogether is not really an option. Thanks for reading. Bigted