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SUBMIT YOUR IDEAGood to know I'm not the only stubborn one round here @DanTh!
So for this one I've gone with creating an index of the months to get around the issue of the months not being definite (multiple M, J and A) followed by a Mod function to reset every 12 lines. I've used the Max function in a multi row to populate the missing years and then a find replace to look up the index and replace with the month name.
Fun little challenge.