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The piece of music on this page translates via Messiaen's musical alphabet to give "épées de feu", French for "swords of fire". There's a dotted line linking this to the logo of the Essex County Fire and Rescue Service - a fire brigade with swords as a logo.

The birds on this page correspond to letters in a code where the right facing birds represent A to M in the order of Catalogue d'oiseaux, and the left facing birds represent N to Z in the reverse order. This is hinted at by the image on the card: two Alpine choughs facing each other across and an ellipsis, which translates as "A ... Z". Translated in this way, the code reads:

ADDSENDERTOSTAMP

i.e.

ADD SENDER TO STAMP

These are instructions to be carried out with the information on the Postcards.