Thank you very much everybody for all the help and info !
Success at last !!!!!
The car now has à priming fuel pump and a powered ecu !!! And I ve been able to plug in the rp-lab software and check the ecu and all sensors and everything seems OK.

So what the problem was on the fuel pump side was that the MSD fuel pump loom was wired in correctly apart from the 12v switched wire which had been soldered to the earth wire of the fuel level sender... A big thanks to Stu Sanderson who sent me the msd fuel pump loom instructions and after removing the fuel tank and cutting into the 5kg of electrical wire I found the problem. I ve now soldered it on to the famous red/Black wire which originaly went through the inertia switch and powered the pump. I ve also put the inertia switch back in as all this had been removed.

As for the ecu relay.... thanks to the wiring diagrams you guys sent I traced the Black switched 12v all around the engine bay... had to open all the loom to follow it and check for continuity and finally traced it to the old ignition coil plug after going through the ignition amplifier (my car has wasted spark and 2 amplifiers and an msd coil) so I think again the ignition loom has been wrongly installed and doesn't pick up the 12v anywhere. After seeing where the Black wire went and seeing it was ready to power everthing it should I pulled another 12vswitched wire from the ignition barrel to the ecu relay to power it.
Everyrhing works !!!!! I m so happy after 2 weeks spent chasing bloody wires all around the place !

Thank you so much for your help !!!
I ll be posting some photos of the car soon
Cheers