I have experienced problems with the post for years. But I discovered today that a number of letters addressed to me were misdelivered and then returned to sender marked "not at this address", meaning that I was removed from the maling list altogether. There is no way of knowing to whom they were incorrectly posted to. It seems that people are often advised to mark any unwanted post "return to sender." However, only letters for your address but for a different person should be returned. Misdelivered items can be reposted in any postbox with a note to say they were misdelivered. This also alerts the recipient that their post went astray in the first place (so that we can complain to Royal Mail and build up a pattern of the problems) This is not to excuse Royal Mail who should not be misdelivering items as frequently as they do. But this may explain many items which are written off as "lost".