It has happened many many times (99%). When I tried to send some plastic bag clips or something else with bubble-wrap or regular envelopes, the staffs asked me what's inside? (Should I have told them it's a bomb? I was not sending package to foreign counties. Why they asked me every time? I think it's private.) And after they knew it's not letters or cards inside the envelopes, they charged me small package fee. (By the way, staffs are no British white, I could find one every time, all look like Arabic or Indian. I am not racism, but they didn't pay attention to me or just ignore me no matter which staffs...maybe because of my English. They insisted to charge small package fee and told me everybody was the same.)
I saw from the internet. It seems like okay to send non-letter with Large Letter.
http://forums.digitalspy.co.uk/showthread.php?t=1005797
I also saw lots of sellers on ebay charging less than £1 postage for their light plastic items, but I don't get it, why post office charged me much more fee?
When I sent my stuffs with Large Letter fee, my profits is minus.
http://img407.imageshack.us/img407/5408/fuckarabics.png
http://img52.imageshack.us/img52/4851/fuckindains.png
更新1:
Did I get charged correctly?! 40 grams but charged me £2.2 to 2.7
更新2:
I know if you send international parcles, they will ask. And I am talking about domestic not international. When I lived in south England, no staffs asked me what's inside my envlopes or parcels. Would a postbox ask me what's inside my envlope? Mr. postbox, i want to report that it's just a letter and two kitchen craft bag clips inside my envelope. It's only 40 grams and I want to send to London.