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I'll do what I have planned and if it persists I'll check the O2 sensor. Thanks. It was running nicely when we started out but deteriorated.
Constable_Savage-
It's not so much a failing sensor. More that they only fitted one so it reads the fuelling from one cylinder. Then when it sets the fuelling for both cylinders from that reading it can cause stumbling at low revs.
Would probably be worth checking the valve clearances as it might be closing up when it's hot.
Airhead
Misfire at low revs could be the single O2 sensor issue that I mentioned when you said you were getting an 1150. It bothered me as it would sometimes stumble in turns.