Thanks for that, just checked invoice, spark plugs definitely changed (our car NOT on long life servicing schedule due to low mileage) would this be reason why plugs changed not because of 25k miles but 4 years old? The following printed on invoice for starting problem "fuel pressure in limits checked software level of engine - ok, carried out fuel pressure test to fuel system using VAS6550 tester, test fuel pressure from high pressure pump, ok. Check holding pressure in fuel line, found holding pressure dropping under specified pressure of 3Bar. Testing holding pressure at fuel filter and fuel pump in tank, found holding pressure dropping at fuel filter. Fuel filter return valve faulty. Requires fuel filter. Replaced fuel filter, tested fuel pressure - ok" .........This doesn't make sense to me because the car is absolutely no different despite them mucking about with it. You mention possible fault with PCV, will take this up with Dealer first thing Tuesday and let you know outcome. Any other thoughts on the above, whats the MasterTech talking about when he says 3Bar, I don't understand but your views much appreciated.