I've tried different sets of plugs, no difference - so I'm content it's not them.
An interesting idea about the injectors, I've not really considered them as there's been no cylinder-specific codes. Think it's unlikely more than one would fail at once.
I will be splitting the manifold when I get chance, see if there's any clues there. It seems to have a propensity to collect condensation on the outside which I find a bit strange - why the moisture prefers that to the rest of the engine I don't know.
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