Checked the fuel pressure again this morning and it is different to previous, Over five tests using tech2 to activate the fuel pump relay I get different results each time, From 2.4 bar down to .2 bar.
With the KOER the pressure is no higher than .4 bar and would drop to zero then pick up again.
Conclusion is stuffed low pressure pump.
Next problem is the retaing ring holding the pump in is a ring of rust, so I was thinking of carefully cutting it into 3 pieces and buy a new ring. [Probably only comes with a tank!]