Guernesey is not part of the EU. Guernsey is not part of the Commonwealth. Guernsey is not event part of the UK. 
Guernsey is a self-governing Crown Dependency. Meaning, foreign relations are handled by the British Government but the island is treated as a part of the European Community. Those Guernsey people are the smartest of all !
Come and find more about live on Guernsey island during the book club on April 21st.
Le Book Club 