This is fixed now.
I sent the PCM to ECU technologies & they informed me that it was OK. They said that they had witnessed a switch from "off" to "on", at the fan control output of the PCM. I mentioned that we had seen a PWM signal on a similar donor car & they said they would re check & let me know. Again they assured me that it was OK & they had verified it against another "known good" PCM that they have.
We took our unit back & after double checking everything I decided to order a new PCM. These are plug n play & just need injector correction factors entering. The new unit performed exactly as expected, with a nice PWM signal.
With hindsight I should have been confident in our own checks & not waisted the 35 quid on testing fees.
Here is a capture, displaying an off state through to a slow fan state.
Cheers all
Dave
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