The site of a former distillery in Three Mills became a dedicated centre for film and television production with the establishment in the 1980s of Bow Studios, Three Mills Island Studios, and Edwin Shirley Productions. In the mid-1990s the three studios merged to become 3 Mills Studios, under the management of Workspace Group.
Workspace Group managed 3 Mills Studios.
It is possible that Workspace Group managed all three studios prior to and after the merger. I think the statement appears at first as definitely correct, rather than ambiguous.