Hi CJ,
That is a fantastic solution, thank you. Mostly, I learnt a lot and became a little more skilful!
Could I ask for one more stab at this- how do I sort so that it displays all year, then months
At present shows 2020 then 2020/01, 2020/02, 2020/03, to 2020/12, then 2021, 2021/01, 2021/02...