The Rothsay Ramblers site has been configured not to allow Public Read access. So if you try to visit the site while not logged in it'll redirect you to the login page.
To change this log in as an admin of the site, and go to Manage Website -> Users and Permissions -> Permissions and Sharing. From there you can grant Read access to The Public, and the site will be visible to all again.
More information on permissions is available in the documentation.
Thanks
Joe - Voice Admin