The whole of Sussex has had a single police force since 1968 .
The appellation Sussex remained in use as a ceremonial county until 1974 , when the Lord - Lieutenant of Sussex was replaced with one each for East and West Sussex .
The whole of West Sussex has had a single police force since 1968 .
The appellation Sussex remained in use as a ceremonial county until 1974 , when the Lord - Lieutenant of Sussex was replaced with one each for East and West Sussex .