Thanks for the suggestions...I have removed the injectors previosly and the pre chambers were gunked up. The mm oil cleaned them out as far as I can see, with injectors and glow plugs removed.

I took the injectors out last night and found a clue Dr. Watson...all lines were full of fuel, (clean and clear) the IP was wet at all elements, the injectors were full of fuel also, BUT the opening of the nozzles was dry on all five.

The operating theory is now
1. all injectors are clogged, and/or 2. the injector pump is'nt giving sufficient pressure to make them work. I'll open up the injectors soon and report back.