With the postal service more and more resembling “snail mail,” look back with nostalgia to “The King’s Stamp.” In 1935, Benjamin Britten composed a score for a short film about the design and production of a commemorative postage stamp to mark George V’s Silver Jubilee. It’s one of four documentaries with music by notable English composers (Britten, Ralph Vaughan Williams, William Alwyn, and Sir Arthur Bliss) that I’ll be highlighting this week on “Picture Perfect,” now at its new time, Saturday evening at 6:00 EDT, on WWFM – The Classical Network and wwfm.org.