Remove 8mm bolts from underneath plenum, disconnect vacuum pipe and unplug air flow meter. Remove plenum. You will then see the fuel rail. Unbolt the mountings and disconnect fuel pipe. Pull plenum out. Undo clamp holding in injectors and replace. Make sure when refitting plenum that the rubber gaskets are seated properly.

It is a bit of a fiddly job, there are a few small clips etc that are easy to loose.