Had this form to fill in and post for 2 weeks. Its so easy, even provided the stamp and envelope. Post gets collected here so I don't even need to get to a postbox. 

Ideally should've been posted by Wednesday.  Didn't happen.
Thursday would of been ok. Didn't happen. 
Friday was last chance, cutting it fine. Didn't happen.

Today I figured, it's 1sr class, it might get there in time for tommorow. Did my bit. 
Postman didn't come.

Probably answers thier question though!