No signs of coolant in the cylinders/on the spark plugs.
Plugs all look the same as well, so I'd reached the conclusion that it's a random misfire across all cylinders, which is supported by no cylinder-specific codes, only P0300 (random misfire) and P0316 (misfire excess emissions).
So from that (plus a compression test that showed all cylinders to have similar, normal pressures) I've ruled out anything mechanical.
EDIT: Should also add that I've done the obvious cam timing check as well.
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