The following is the guidance we have received from British Marine:
Marina operations can remain open subject to up to date risk assessments and COVID-19 protocols as follows:
Marina leisure berths: can stay open, and in general restrictions on travel have been lifted so boat owners can travel again to use and maintain their vessels. However, the government advises against overnight stays away from home, other than for specific reasons when in Tier 3. Marinas should remind customers to follow the guidelines and to avoid travelling in from Tier 3 areas.
Boatyard Operations: including lift out and boat repair/refit are permitted
Food & Beverage: Cafes, bars and restaurants on marina sites must follow the correct procedures for the Tier.