The clues mention at least two British Series "Between the lines" and "Ever decreasing circles"
Since the clues are actually "no clues" and only help us I think these series are relevant:
1) Picture 4 could lead us to "EastEnders". It shows the map of London East.
2) Poem 1 mentions "Jewel in the Crown". It has 14 episodes. No 11 is "Travelling Companions" "It is 7 August 1945, and the atomic bomb has just been dropped on Hiroshima. In Ranpur, Barbie is dead. Sarah learns to her great distress that Ronald Merrick, with Colonel Layton's approval, i...." For me this is another hint to "Little boy" or the date of Hiroshima itself is the solution
3) Some of you mentioned a hidden Morse Code. I don't believe there is any. Instead there is the series "Inspector MORSE" One of the episodes is "Greeks bearing gifts"