Proper Grub was a company that made vegan fake meat, based on Clifford Jones's fungus. It was based in Llanfairfach. Jo Jones and Clifford owned the most shares in the company, until they sold them to BOSS masquerading as a businessman.
BOSS started making food from giant maggots instead of the fungus, however eventually became subservient to higher forms of the maggots which had evolved and taken over the company.
In the 2010s, Jack Harkness and Jo Jones investigated the operation following the death of one of Jo's old friends and reporte of giant flies emerging. They discovered BOSS and the giant maggots however Jack made a deal with BOSS to allow the company to continue operating providing the giant creatures remained underground. (AUDIO: The Green Life)
In 2018, Jeff Morris' girlfriend cooked him Proper Grub sausages for dinner. (AUDIO: Cardiff Unknown - October 2018)