What’s a normal British life skill that nobody teaches you, but everyone somehow has to learn?

I missed a Thames water bill for 8 months recently (it looked wrong and I needed to call to get it sorted... so it just never happened). I finally called them when they sent the third letter from a collections company which pretty much said "if you don't answer us this time the next letter will be us starting court proceedings". That's a level of procrastination I wouldn't recommend tbh (got it sorted eventually, the bill was very wrong, went from ~630 to £55). At a previous address fifteen years ago when housesharing with mates I forgot to get it switched to one of them when I left and got a call from Thames water two years after I moved out. That took a while to sort but eventually I paid nothing and provided no names of ex housemates (they'd all moved on and I didn't think it was right) or forwarding address for myself.  Yeah, I'd leave them til last for payments.