There are two National Codes, developed by DEFRA and links can be found below:
The Marine and Coastal Wildlife Code was released in May 2023 by DEFRA and can be found here: Marine and coastal wildlife code: advice for visitors – GOV.UK (www.gov.uk)
Countryside Code contains wider guidance around responsibilities for visitors to the countryside and those who manage the land and can be found here: The Countryside Code – GOV.UK (www.gov.uk)