ATTN: PBS addicts! Is Inspector Lewis' sidekick Hathaway bisexual?

I'm watching the series on video, the last one I saw (#9) had Hathaway solving the identity of the killer of Lewis' wife. Anyway ... in one episode, although it contains a scene of him with a woman, Hathaway refuses to identify as straight when asked by Lewis, giving an evasive answer. And, am I the only one who finds their boss lady a Grade A, #1 bitch?

The%20Cultured%20One
• He's straight I think. Used to study to be a priest and also has an affair with one of his female colleagues. I remember there was some ambiguity but wasn't that cleared up in the episode you saw, OP?

• In the episode where his sexuality was in doubt, he did the nasty with a woman, though I think she was a post-op transexual. The episode I saw last featured an Iranian Oxford student actor - my first reaction on seeing him was "SEX? YES! NOW!!"

  The%20Cultured%20One

• they kept it vague/bi hinting in a couple of early eps, but more and more he is straight in the show