I don’t how English post works either and I live in England
It’s a complete lottery on how fast something will turn up…if it does
My experience is different. Royal Mail has worked pretty well for me over 30 years in business with only the occasional blip and no lost items or failed deliveries. Hermes on the other hand are cheap but often unreliable. One example - about 3 weeks ago, on a Saturday, I booked a Monday collection from my home address for delivery later that week for a birthday. They never did collect (not even later that week) and never notified me that they couldn't. Not only that but I couldn't find a way of talking to anyone and, later of finding a way to cancel the order. Going through the complaints procedure was painfully slow and difficult. A horrible experience. Unfortunately, although that's my worst experience, it isn't my only one.