As buster said if it is comming from the fuel return (spiller pipe) its not the end of the world. Just bought one for mine, about £20. Also, where this pipe connects to each injector, check that there is a brass washer either side of the banjo bolt.

If non of the above... sounds obvious but is the injector tightened down properly. If so there is a brass washer at the base of the injector (inside the head) that i guess could be fooked, but cant think why this would be unless you had been messing with the injectors.
 

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