You bastard, I sent you a lot of first-class stamps — how come my Ansibles arrive by second-class post?
Sorry, I really don’t have time to keep track of this kind of thing. Ansible is officially available for stamped addressed envelopes: if you put first-class stamps on your envelopes, you’ll get it by first-class post. If you just send stamps, I’ll just (try to remember to) make a note of how many issues they represent, and put the stamps in the postage book..