The Midsomer Murders episode was Dark Secrets. Edward Fox (perhaps best known for The Day Of The Jackal) played the murdering husband.

As for hoarding, perhaps the things we tend to hoard vary by sex rather than hoarding itself? I have a tendency to hold on to things that I think may come in handy for some project or task some day… I suppose I could extend it to fasteners. If say, I needed 6x1” woodscrews for a task, I’m going to buy a box of at least 100 and I’ve got 4 big organiser boxes full of wood screws, wall plugs, machine screws, matching nuts, etc. in my shed. I’ve also got small selection boxes of things including a few of types of small stainless hex head screws and threaded inserts, in my room. Of course, I’ll never use all of them, some maybe never again/at all but I do like to feel I’m pretty well equipped with these things.