Sending things in the post may be the acceptable method of sending sensitive data. I'm guessing that the UK prosecutes people who mess with the post the same way that the US prosecutes people who mess with the mail.
EDIT I'm not sure what I'm talking about. Was the complaint about "27 DVDs" just the amount of data or the method?
EDIT I'm not sure what I'm talking about. Was the complaint about "27 DVDs" just the amount of data or the method?