No, fuel trims are all OK, but I found the problem when removing the ECU for testing! There's a small ground wire connected to the ECU probably because the ECU is bolted to the plastic manifold; and guess what it was slack! Cleaned the tag and the ECU, re-tightend and the problem has gone away. I'm one happy chappy to see this one go. I think it was James Dillon who said don't forget to use your God given senses as well as your test equipment!
Thanks to everyone.
Mark
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