@Philip Mcfadyen Can you contact support to report this, please? We're having issues with several of the collections. Reporting it through support is a way to get it to engineering to investigate/fix the issue. You can click Help in the top right of the FamilySearch page and then Contact Us to see the phone, chat, and email options.
I am certainly no expert; but, as far as I am aware ...
I believe that the "Contract" between the Record custodian and "FamilySearch" for the 'Scottish' Census' may have "Changed" recently; and, there NOW seems to be "Restrictions", imposed by the Record Custodian, on viewing/accessing the said "Indexes" in/through "FamilySearch".
That said ...
Such "Contracts" between the Record custodians and "FamilySearch" are renewed and change regularly - of late, more often than not, "Restrictions" are imposed; and, and such "Indexes" (and, "Images") can NO LONGER be viewed/accessed.
I know that this does not help.
I did this and was told it was a computer problem, so I did all that i was advised to do and no change. I have contacted them again.
That would be a big shame