Well mate, putting aside the whole story about why you need an external FPR (I guess because of the non return thing), I think the whole thing is easy to sort in steps:
- undo fuel lines at the pump, turn the key over, you get a fountain - pump is good and priming works, no fountain, then check with VM if the ECU tries to prime,
- if all goes well, do the same thing with unconnecting feul feed at the rail,
- both fuel pump and coils are switched on by the ECU during priming and once it sees cerain RPM (450 IRCC, but do not quote me on this), if the pump is not working then either (a) the ECU is coded, (b) it does not see the RPM, CPS is not working, or its signal does not get through
- your Injector WL is ON I can see on the vid. GET THE DAMN TESTER (you say you have access to one) / DIAGNOSTICS HOOKED UP TO IT! The cable is 20 quid or so, the software is free, I assume you do have a laptop or can borrow one.
(I will not ask things like: are the coils/injectors connected in the right order, or is the timing set up correctnly and not shifted by 180 degrees or something like that, I assume you got this sorted out).