Apparently the car has an intermittent engine oil leak. Sometimes it will produce quite a pool, other times a few drips, but so far untraceable.
The car has been with Halfrauds (I know) for quite some time, and they have managed to achieve only one thing, losing the undertray.
So does anyone have any ideas where the oil might be coming from? I suggested a first port of call was to replace the PCV (Positive Crankcase Ventilation Valve) filter, but are there any other known leak points?