Just a quick update:
Had a play with the connector at the weekend - stripped the contacts out of the plastic housing and connected it all up.
Still had an error on the O2 heater, so I'm going to miss out the ecu on this altogether (and turn off the error warning) and wire it straight to the battery via a relay (for ignition on).
The actual O2 sensor seems to be behaving, with a voltage of between 0.3v and 0.5v, so that could have been down to a bad connection, and may further improve with the re-wiring of the heater.
Once the heater is re-wired I'm going to take it to a garage to get the emissions checked, both with the original Hondata map and then with John's.
Tim
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