Something of a mystery. All I know about the Fox label is that a Rock band named 'Mississippi' put out a single on it in August 1970; the single was called 'Mr. Union Railway Man', and it had a catalogue number of FOX-1. The simplicity of the design suggests a DIY label; pressing was by EMI. A copy on ebay a few years ago (2008) went for serious money. Thanks to Robert Bowes for providing the scan of the issue.
Copyright 2008 Robert Lyons.