What is "co-co"

Co-Co were a five piece British band who represented the UK for the Eurovision Song Contest 1978, staged at the Palais de Congrès in Paris, France, on 22 April 1978, with the song, " The Bad Old Days". The song was written by the husband and wife team of Stephanie de Sykes and Stuart Slater. It finally placed eleventh of the 20 entries, which at the time was the worst showing ever for a UK entry. It would not be until 1987 that any British song fared worse in Eurovision. The group were originally called Mother's Pride.