you havent got to take the inlet off on series 1 take the throttle body off as these dont have spacers like series 2 not enough room with throttle body on
best way to do it is to remove the 8 mm bolt lift the injecter up slowly and then spray loads of wd40 on the injecter and collect push the collect down and then you will have a 12 or 13 mm ? nut on the injecter hold this while you undo the fuel pipe best way to do it without taking the inlet off