The rival Scotsman has an excellent website with full access to backdated issues. I presume that the Edinburgh paper wants to attract as much attention as possible through the internet and I note that it carries advertisements on its individual news pages, not just on the homepage. The Scotsman has won an award as “Britain’s Best Daily Newspaper Website”.
It looks as if the Sunday Herald is not operating this new policy. Good. As far as the Herald itself is concerned I find it rather disconcerting to read that paid access to its backdated articles ("Scotland's national news archive") is “governed by and constructed in accordance with the laws of the State of Michigan”.