I didn't know about the ridged fingernails; that's curious; it makes me think he might have had labile TB picked up from Christopher.

It does affect the nails; I hadn't thought of that. I knew someone with heavily ridged nails on two or three of his fingers, but that was because they'd come off from exposure to industrial cleaner when he was in his teens or early twenties and grown back unevenly. If Hodges knew any kind of story like that about Turing, he'd have told it. Interesting.