alphagov/transition — pull request #113 by jamiecobbett (2013-12-09 16:01:57+00:00)
Title: Require all archive URLs to be for TNA

As a mitigation against malicious URLs being entered by malicious users or attackers, prevent any URL that isn't The National Archives web archive.

All of the existing custom archive URLs I could find were for this domain.

This was one of the outcomes of the penetration test.