As of 1 January 2022, The UK Government has implemented new reporting procedures if you are travelling to and from the Bailiwick to Great Britain and Northern Ireland using your private pleasure craft/vessel.
This means visiting private vessels will have to contact the UK National Yachtline to register their outward and return trips to and from the UK and the Bailiwick of Guernsey.
Visiting vessels will also have to complete existing Customs and Immigration checks on arrival into St Peter Port Harbour by Guernsey Border Agency officers.
It's advised that private vessel operators should read and understand the requirements from HM Revenue and Customs, and other applicable agencies e.g. the UK Border Force, before embarking on a journey.
Further and detailed information can be found using this HMRC weblink: Notice 8: sailing your pleasure craft to and from the UK.