New injectors cured the problem and they didn't need coding (8v siemens). I had the old injectors tested at a diesel center in Swansea (LLandore Battery Centre) The guy down there is worth a plug very helpful and free with info.
He said these injectors are a pain in the a**, just introducing air into the system can cause them to go on the blink, such as fuel filter changes. With a set of injector near £500 they are always going to be scary to work on. As has already been said, inform your customers before carrying out any work on the fuel system.
Thanks to every one for their contribution it's been a great help.
Mark
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