The series regularly lampooned Margaret Thatcher's perceived domineering attitude towards her Cabinet, through Mrs Roberts's heavy-handed management of her fellow councillors, accompanied by withering one-liners at their expense (delivered in Jo Kendall's foghorn-like vocal imitation of "Mrs T").
The show used Mrs. Roberts's heavy-handed approach to managing her fellow council members as a way to satirize Margaret Thatcher's perceived domineering style. The humor comes from the exaggerated portrayal of "Mrs. T" and the sharp, cutting remarks she delivers.