I know you guys like short theories, so here's my long one condensed into meaningful sentences.

Bruno Heller says Redjohn likes Cold. Sophie Miller who conveniently only takes notes vocally says RJ has acrophobia (a fear of heights). Or does she? She could actually have said Jay Roth, aka, Redjohn has Acaraphobia, a fear of crawlers, termites and insects that bite. Why does RJ like cold? Because insects are cold-blooded and hate the cold, ergo, RJ doesn't have to deal with them.

Look at Partridge in the desert, season 6 episode 1. Geez, the buzzing of flies gets more prominent through the scene. And Partridge behaves oddly compared to his energetic, nerdy self. He looks very bothered. It would be easy to think its because of Patrick staring at him, but Partridge is irked by the flies. The location of the shoot was picked because it had a fly infestation. Of course the actors didn't know why (they had a good laugh about it), as Heller wanted authenticity in the shooting.

(Funny non-fact: Partridge likes pigeons because they eat termites and insects)