Until the early 20th-century French was the only official language of the Bailiwick, and all deeds for the sale and purchase of real estate in Guernsey were written in French until 1971.
Kuni 20. sajandi alguseni oli Guernsey ainus ametlik keel prantsuse keel, kõik kinnisvara ostu- ja müügitehingud Guernsneys teostati veel 1971. aastal prantsuse keeles.