Turns out it was the balance shaft nut.
Thanks Mezo, that post is exactly what was wrong with mine, not quite as severe though. Dont know how I didnt see that post before in my hours of searching rather than spending the hour or so in diagnosing it properly.
The noise definitely sounded like it was coming from the left, but I guess not.
Oil looked fine, so probably no damage done hopefully, these engines seem to go on no matter what anyway.
Thanks
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