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I've now removed both heads.
The misfire fault sticks out like a sore thumb - Blown gasket between 2 and 4 cylinder.
What is a bit concerning though is that the right hand rocker cover internals were covered in oil/water emulsion. The head gaskets look fine between the oil and water galleries.
The liners are all level and show no sign of movement so how is the coolant leaking into the oil?