George & Mildred S02E06 The Dorothy Letters 1977

While Mildred is cleaning, she finds an old case which contains many love letters written by George to somebody called Dorothy. He refuses to tell her who Dorothy is, so she takes George off for some relationship counselling. At the session, Mildred tells the counsellor about the letters, but he refuses to talk about them. At home, he admits to Mildred that they were written to Dorothy Lamour and that he never sent any of them.