Through the Emergency Powers (Coronavirus) (General Provision) (Bailiwick of Guernsey) (No. 5) Regulations, 2020 and the regulations made subsequently, 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. This is a legal requirement, and failure to comply is a criminal offence. In your 14 days of mandatory isolation, you must not leave your accommodation and you must not leave the Island.
Travellers arriving in the Bailiwick must fill in a self-isolation data form which can be found here: Travel - Self-isolation data form and legal advice from 7 August 2020.
More information is available below.