Thanks!

having posted the above I now see the page I found has 'proposed feature' in the url, which should have been a clue

Thank you so much. After running this route on Sunday I wanted to update some things that seemed to me incorrect (especially near the layby half way between falmer and woodingdean) and also note the temp closure. I'm quite new to this so looked on the wiki and found osm.wiki/Proposed_features/temporary#Example_2:_Road_closed_due_to_demonstration
I've now edited the path with the suggested you've provided. Also, June 30th is a estimate by me as the council website was a little vague (~15 weeks).
I was a little brash with this edit, eg I also completely changed how the carpark at woodingdean is tagged, is you spot anything else very open to corrections :)