If you've had a flashing glow plug light and restricted power issue then it's not possible that the ecu hasn't retained a dtc code. Have you ever seen any errors on this car on any scan in your ownership?
I have only when the engine check light come on. But this time no error. I have taken to a reputable garage and they said nothing on diagnostic except they have done injector test again and have seen other injectors are on their way too. But 600 pound bill if that need fixing. I drove the car back home and now looking for new car
If anybody wants can take this car for cheap.