My son had a review with his manager and a couple of problems were identified and he was told he would be put on a personal improvement plan- no problems there it was warranted- time-keeping. However the email containing the personal improvement plan was emailed to another member of staff in error and this member of staff proceeded to show everyone in that department the contents. Who's in the wrong, the manager or the other member of staff or both of them, what would you do about it?