There are no travel restrictions for travel into Hawaii from the Continental U.S. as well as travel within the Hawaiian Islands. As of March 26, you no longer need to quarantine, take a COVID-19 pre-travel test or show proof of vaccination.
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Domestic travel
Documents for travel to/from Hawaii and within the Hawaiian Islands are the same for any other U.S. state. If you are flying to Hawai'i within the United States, you only need a valid government photo ID.
You'll need prior authorisation to enter the United States using a British passport, either through a visa, a Permanent Resident Card, or the Visa Waiver Programme.