Premise: Wanda Ventham (born 5 August 1935) is an English actress, known primarily for her role as Colonel Virginia Lake in the 1970s science-fiction television series "UFO", and for her recurring role as Cassandra Trotter's mother Pamela Parry in the sitcom "Only Fools and Horses" from 1989–92. She also appeared in two episodes of "The Saint" alongside Roger Moore.
Hypothesis: Wanda Ventham liked working with Roger Moore.