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Hi, I have a 1993 1800 import engine fitted to an early MGB. Japanese market engine had ecu loom cut at firewall. The Ecu was from a manual vehicle and is an 8 bit unit with two yellow input plugs. ECU code is BPF-3.Does anyone have such a loom, would a US aftermarket loom do the job or should I start from scratch and install aftermarket ecu etc. Any advice gladly accepted

Welcome! Might be useful to add your general location to your profile in case there's someone nearby that can assist with a loom or access to a loom.
-To clarify, are you saying you've got the engine bay loom, but are after the loom from the firewall to the ECU including the plugs that plug into the ECU?
-Can confirm the BPF-3 ECU were JDM MX5 NA8 ECUs, while the ADM MX5 NA8 ECU was a BPF-6.
-There should be secondhand JDM OEM NA looms available locally for a very reasonable price.
-Alternatively, a number of other early to mid 1990s Japanese vehicles used the same 26 pin & 22 pin plugs used on the NA6 & NA8 ECU, so a trip to a wrecker to obtain the two plugs including their pigtails of wiring could be useful.
-IRCC, a US aftermarket loom may need repinning of a few pins.
-An aftermarket ECU & loom would be a more complex & expensive solution than using the OEM ECU. For example a Toyota 4AGE 20 Valve Silvertop or Blacktop ECU only requies a relatively small numbers of wires to run a Toyota 4AGE 20 Valve Silvertop or Blacktop motor, but not sure if this applies equally to the Mazda BP (1.8 ) ECU & Mazda BP (1.8 ) motor.
-If you opt for an aftermarket ECU, then the Speeduino would be a good option:
https://speeduino.com/shop/index.php?id ... er=product
You can read about the Speeduino here as the developer is on this forum & lives in Victoria:
viewtopic.php?f=57&t=68123

I would try to get another factory loom and ecu as it would be more difficult and expensive to go aftermarket.
Now the hard part is finding the matching factory bits.