You are quite right - when the buses run, nobody else can use the road: But that is just August.
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Yeah - I would love to do Iddu's Imber ride: But alas - he can't run it: On the days it is open, they ship people in on the buses - which means no bicycles. Which is a shame - the views look amazing.
Imber: Well, AFICR they were irritating in that they reduced the August open day(s) to
one, such that ONLY the ImberBus day ran, blocking everybody else
and then Pandemic...waiting to see what dates 2023 brings; I could go and run around New Year accessibility period, but that's hardcore nutter territory - Could be (/has been) anything from crisp & cold thru driving wet gales to deep snow...
SPTA: Unless there's Squadiies on the Verdette saying "NO", generally you're OK on the Bridlleways/RUPP's , but make sure you follow the correct line, by GPS or dead reckoning - not every track branching off is public usage...