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Just swapped the loom on a 1996 OBDII car to an OBDI loom and now I have no fuel pressure.

All I swapped was the: Engine loom that goes through the bulkhead to the ECU, the ECU, Distributer and VAF.

I'm in the UK so we only have 2 O2 sensors even on our OBDII cars so its nothing to do with that.

I thought it might have been the immobiliser causing trouble as there is a little red light flashing on the steering wheel near the airbag.

Anyone swapped to an OBDI loom before?
Would the immobiliser cut the fuel?
Has anyone got any ideas?

A typical immobilizer install will cut, and use remote relays to reconnect 3 or 4 different points;fuel pump, ignition, starter, and distributor.

Your old engine harness probably had 5 or 6 black wires run to the distributor harness connector. Most of these wires are dummy wires, two of them will be wired to the distributor connector.

What I don't get is how the immobilizer doesn't send a signal to the relay (for the fuel pump) to switch it on, but the relay signal for the starter is working as the car is turning over.

How would you enable the fuel pump? Replace the fuel relay (mounted on the ECU bracket) with one which has a circuit permanently bridged, or maybe just bridge the relay's switched connections to close the fuel pump circuit?

This is educated guessing based on section F2-113 of the manual...

Swapping a pre Pentium harness into a car makes no sense IMO so good luck with your problem. Double check your crank sensor system. It sends power to the pump.