Day of the Triffids is definitely a memorable movie.
I think I saw it when I was 8 to 10 years old.
I would never have been able to get in to H & C’s audience.
I watched them on cable way out in the flat lands of Western Ohio.
The best version of Day of the Triffids is the mini-series from 40 years ago. The whole thing was on Youtube several years ago, but I’m not sure it is now. Here’s a review of it: https://www.youtube.com/watch?v=0HSo9w6souM
The more recent mini-series version is terrible.