Congratulations to Cerys J, Year 7, who came in the top ten in a Blue Peter competition to celebrate 100 years of GCHQ, the Government Communications Headquarters near Cheltenham. Viewers need to design a poster marking our 100th anniversary and hide the word ‘Enigma’ in it using a code. Her design features the iconic GCHQ ring building with their logo and core values. Her coded message includes Morse code, semaphore and a cipher. Can you crack Carys's code?