Coinneach

This is my second attempt to find an answer to my starting problem on this forum. I am at a loss as to the cause of the problem and It is very difficult to describe the problem, but here goes. Car: Skoda Octavia 2008 1.9 tdi Elegance, 45,000 miles. Car runs perfectly normally, this is just a starting problem. The problem only occurs when the engine is hot and the first start attempt after a run. After the engine has cooled and when cold, it starts perfectly normally. The problem: When the engine is hot, and at the end of a run, if the engine is stopped and then restarted, it fails to fire smoothly and regularly. It just sounds like a jumble of cylinders firing, completely irregularly and ends by not starting. It is not that the engine does not fire, and you have to keep turning it over on the starter. Not at all, the engine does fire up but irregularly as if it was firing in the wrong order. It is just a jumble of sound. As a rule, on the second attempt, it will then start normally, today though it did it twice in a row. I have had the car into the Skoda garage here in Spain 3 times. Unfortunately, it has never done this bad starting while at the garage, so they have to rely on my description. The first time, it was diagnosed with a timing sensor failure and this was replaced. This did not cure it. The second time, they thought that the timing might be out, which it was marginally, so they corrected that. That made no difference. Today, I had it in again to have the starter motor checked and cleaned as they thought that perhaps the engine was not getting turned over fast enough. (I never had any faith in that diagnoses) That has made no difference, it started badly the first time I tried it after coming off the motorway on my way home. Having started (or not started) badly, why can it then start normally? To me that would rule out failed or faulty heat sensor, (was suggested in the past) because if that was causing it to start badly the first time, it would surely do it the second time. If the ecu thinks the car is cold (when it is actually hot) due to a faulty heat sensor, and puts in too much fuel for a hot engine, would that cause it? And if so, why would it be ok the second time. It is a complete mystery to me, and to my Skoda garage it would seem, so if anyone has any ideas, Please Help!