Turns out it was the particulate filter. Remote interrogation was ‘non-conclusive’, and that caused a bit of head scratching in the workshop. They ran a couple of processes that took over an hour with the engine running and they sorted it.
The diagnosis was that I need to give the car a good run out occasionally……certainly in the last three months it has had very little use and then for very short journeys due to illness so that makes sense.
£242 later I am a (relatively!)happy bunny and still well ‘in pocket’ against the cost of extending the warranty.
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