Something which I often thought about when I was a postie.....
How exactly is the post delivered by Royal Mail on Oxford Street? There must be tonnes of it. It won't fit in a few pouches for a few postmen to whizz through the streets, you can't push one of those big trolleys up Oxford Street because of the crowds, likewise with a van there's nowhere to park.
That's the only question I've ever wanted to ask, my life will be complete when I know the answer.