In reply to PeteDP:
As Frank the Husky says the bothy was locked 10 days ago but not the toilet section (with resident rat). I ended up divvying outside and a few others were camping. Things may have changed since with further unlocking in Scotland.
Also worth noting that Orkney ferries, who run the Stromness to Hoy ferry, have introduced a moronic system of booking (presumably for track and trace). This involves booking the ferry by phone at least 1 hour prior Worse still if you want to take the early ferry on Monday mornings you have to book it some time on the previous Saturday. The locals are severely peed off as you may imagine.
Hopefully this madness has now been canned with the change in regulations but I wouldn't hold your breath.