Thirteen and spiders for Halloween

Very quick notes on the latest Doctor Who episode, 'Arachnids in the UK'. I finally watched it; I was holding off for a couple of days, because I have very bad arachnophobia (seriously, it's bad if you're scared of them in Finland, because we don't have any venomous ones or even big ones compared to most places), and I was in a state of mind where everything was freaking me out anyway. But I felt better today, and it's Halloween, and I was missing the Doctor, so I watched it. Yes, I know I haven't commented on 'Rosa' at all, but it deserves a more thoughtful comment than I've been capable of lately, so I'm just jumping straight to this one and coming back to 'Rosa' later.

( Arachnids in the UK, totally spoilers )