ok, so here goes, fist the photos then the explanation
in the top photo this is the set up as the vehicle came from the British Army, as far as I know. I have not altered it and the soldered seal on the pressure relief valve was stamped with an inspectors mark. It would appear to me, that the British, or a later Ford modification, has directed the oil relief flow to the point above the fuel pump as you can see in the photo. It is this oil flow, that I believe is finding its way into the fuel pump and flowing out of the petrol relief hole.
The set up as seen in the photo from the TM is quite different. It would appear that the relief valve is on the other side of the two pipes to mine. In other words either the pick up pipe has been changed on my engine, about 12 months later than the date of the TM, or it has been muddled by British Army when they made this mod.
So in the TM photo, it would appear that the pipe nearest in the photo is the return to the engine and the outlet pipe to the oil cooler has the oil pressure gauge and the relief valve attached to it. I assume if there is a restriction in this circuit it returns through the brass interconnection back to the return into the crankcase.
On my engine , you will see that my pressure gauge and relief valve are on the other pipe and the relief has been redirected to the oil filler pipe.
It may well be that I have followed the schematic in the TM ( another diagram not illustrated here) and connected the pipes on the flexible section of the oil cooler lines the wrong way around. I can check this today, but it still does not explain why these pipes are completely different from the set up in the TM. Go figure, and if you can work it out, please let me know.
Meanwhile, I plan at some stage to remove both pipes and check which way the oil flows from my engine left or right pipe then I can connect the cooler pipes the right way around for sure.