The mystery of the dead wartime carrier pigeon found in a chimney in Surrey, which we brought in August, may remain unsolved as decoding experts at GCHQ have been unable to decipher the bird's message. Here is GCHQ's explanation of the reasons, and the BBC's report on the latest developments.
The story has attracted widespread coverage, and was the topic of a special report on BBC's Breakfast programme earlier this month. Watch the clip from the programme here.
If you want to have a go at cracking the code yourself, here is the message below.