Quote Originally Posted by Logunner View Post
Your statement on "knowledge of the subject matter" confirms how little knowledge you have of the subject matter.

A large percentage of RM goes by aircraft, aviation rules do not allow pressurised containers. The journey to Belfast is by Sea so low risk... Also to be considered is the mechanical handling and sortation equipment used in processing the mail, again a risk if a pressurised item becomes trapped.

Feel free to correct me if your knowledge on this is greater than mine..
I have it on excellent account of a senior RM manager that all of Britains mail delivery is now by road and ferry. They only fly the post over seas, naturally. That's not to say that RM don't X ray boxes routinely especially if the sender has said either the wrong thing or too much at the post office.