Here are a few words from editor John O'Leary explaining the Times Higher Education Supplement's policy on dealing with corrections.
Online corrections are a problem, as you say, particularly if an item
has appeared in print. We don't want to rewrite history and nor do we
want to be haggling endlessly over back copies.
Our approach is to correct statistics where they are demonstrably wrong
but not to go back on copy unless there is a legal issue. I am not at
all reluctant to carry corrections in the paper, which should come up
when an article is accessed through our archive.
Thanks, John. I think this is a useful topic for investigation and will make further inquiries, both to try and identify models of journalistic good practice but also to help PRs who feel their clients are being misrepresented develop constructive correction strategies.