Listen to Postcript to the Retreat at Dunkirk online. Postcript to the Retreat at Dunkirk is an English language song and is sung by John Boynton Priestley. Postcript to the Retreat at Dunkirk, from the album The Most Famous Speeches, was released in the year 2013. The duration of the song is 0:48. Download English songs online from JioSaavn.