Hi there ..Just to up date ...I did a full service .replacing all filters ..it appeared that even though the vehicle has a full service history the fuel filter looked to be original factory fit .also the oil filter/canister was so clogged it had collapsed inwards on it self.I also removed the MAF and used CRC air sensor clean ..also stripped off the egr and using some petrol and old tooth brush i gave it a thorough clean ..this was all carried out by myself .I used a code reader and done a regen on the particulate filter also used a fuel injector cleaner .the car has run to perfection ever since ..I do have a slight problem on starting when the temperature drops but only on the initial start up so i will be changing the heater plugs this weekend .thanks to all that offered advise .