Thanks to everyone for your thoughts, much appreciated. I'll have a trawl through the old postings to see if the reference data is there as it will be great to get a full set of readings.
What a pain this has proved to be but I've got there in the end. Pre Pscan I tried new lambda, new sensors with no luck (good old stab in the dark method) but no improvement.
Post Pscan I narrowed the fault to the fact that the lambda remained inactive and there was no fuelling compensation, more testing of wires, cleaning of contacts, removal of the misfire system (unique to the Elise 111s) but no progress at all. Tried a new (used) Mems 2J, no progress there either. #getting p*ssed off!
In short after eliminating all causes I've come back to what I assumed was an unlikely culprit....I replaced the new lambda I fitted a few months ago (genuine MG) with a new NGK one and some new plugs for good measure and....
After under 30 seconds the lambda goes active, the lambda voltage varies and I have fuelling compensation too! All looks well. It really does prove that old point don't assume it's good even if it's new!
Just need to fit everything together and give it a thorough road test before getting the emissions checked.
Thanks all.
Thanks to everyone for your thoughts, much appreciated. I'll have a trawl through the old postings to see if the reference data is there as it will be great to get a full set of readings.