The Shed Scales were a force which was fought by several organisations.
Sometime before the Armistice, Faction Paradox sent Mullion on a mission in which she "fought the sick Shed Scales alongside runagates and aconites". (PROSE: What Keeps Their Lines Alive)
In the 2010s, Giles and Archie of PROBE, during a week of celebration after their trip to Helsinki, took on a pack of Shed Scales in the United Kingdom. (PROSE: The Door We Forgot)