Thank you all for your responses. LTFT is always +25 which i believe means the ECU is trying to compensate for a lean mixture. I understand the link between high O2 and a misfire, however when the EML is cleared the vehicle runs lean but with no misfire present. However, I will be keeping an open mind on my next visit (when I'm in the area) and post freeze frame data etc.
Regards
Pete M
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