Online postage
This time of year especially, I find online postage is a a real help. I avoid going to the post office to queue to send my international Christmas cards.
You have account and top it up with credit then put in your address and details of what you are sending them print off the label. Either print on an adhesive label or print on paper as I do and sellotape to envelope Nd pop in the post box within 24hrs (it tells you when it is valid until).
Saves queueing out of the door in the cold, wind or rain. Good for when you run out of stamps too. Google Royal Mail online postage and you should find more details.
A learning experience is one of those things that say, “You know that thing you just did? Don’t do that.” - Douglas Adams