For anyone interested in this subject i have now removed the pulse unit from the car. Strangely enough although Ford tell me they never made a Mk5 Escort Zetec without a pulse unit Ford actually list a part called a 'non pulse unit blanking plug' They are the proper plugs if you want to make a neat job of removing the pulse unit. I bought 4, removed the pulse unit and have been running the car for the last week without it. Unsure about emmision readings but i can confirm that the car is running better than it has ever run!!!!!!!!