Evan Davis continues his exploration into deception by talking to those who've had cause to be economical with the truth. We think of truth and falsehood as simple binary concepts. Statements surely have to be one or the other. Well not quite. In these interviews Evan meets people who've found themselves on the fuzzy boundary between truth and falsehood. This week he meets Penny Gadd who lead life as a married man but who became more and more aware that she needed to change sex. She'd concealed her feelings for years and as in so many deceptions she'd concealed them from herself too. Producer: Lucy Lunt.