When Peace was declared the codebreaking activity had to stop and Churchill ordered all evidence to be destroyed. The Park was disbanded, but some managed to continue to break ciphers in the Government Communications Headquarters.
Bletchley Park was decommissioned from British Intelligence in 1987. The truth about the work there was secret until the 1970s and their achievements are still to be recognised.
In 1991, the Park was under the threat of demolition when the Trust stepped in and created the Museum.