Hi Mark - History is on by default for some commands like Loft and Sweep and off by default for others since it can sometimes tend to be surprising. But you can turn on history for the result of Flow by selecting the result of the flow (the resulting deformed object, not the original base object) and enabling history on it using Edit > History > "Enable update" button.

- Michael

Ah that makes sense, I had tried turning it on but for the base object and not the result.
I will give that a go then,
thanks Michael!

Got it, works exactly as I wanted, thanks again!