Through the Emergency Powers (Coronavirus) (General Provision) (Bailiwick of Guernsey) (No. 6) Regulations, 2020, the Civil Contingencies Authority has imposed a requirement on all persons arriving in the Bailiwick from anywhere in the world (with the exception of the Isle of Man) to self-isolate for 14 days on arrival, unless they are eligible for and opt into the test on day 7 option. This is a legal requirement, and failure to comply is a criminal offence.
Where you are required to self-isolate for 14 days, you must not leave your accommodation and you must not leave the Island.
Where you have opted into the test on day 7 option, you may only leave your accommodation when you have received a negative test result. You must then comply with the conditions and restrictions ("passive follow-up") until the 14th day after your arrival in the Bailiwick. You may visit Herm, Sark and Alderney while you are subject to passive follow-up.
Travellers arriving in the Bailiwick must read thoroughly and complete the self-isolation legal and advice data form which can be found here.