Les immediately suspects Christian Habgood, Denise's tutor at Charnham College. However, when she enters Graham Harker's (Lee Warburton) cab, Denise suspects him of the crime based only on her recollections of the smell of his aftershave and his usage of the phrase "Scout's honour".
Les suspects Christian Habgood, Denise's tutor, due to a strong suspicion that he is involved in the crime. Denise suspects him because she remembers the smell of his aftershave and his use of the phrase "Scout's honour".