5 sections of The Countryside Code are dedicated to helping members of the public respect, protect and enjoy the countryside
Be safe, plan ahead and follow any signs.
Leave gates and property as you find them.
Protect plants and animals and take your litter home.
Keep dogs under close control.
Consider other people.
Most of the above is obvious and self explanatory. Many beaches have extra local bylaws in place in order to protect the environment where there are extra risks. These bylaws cover a multitude of things which might not be apparent at first glance. Here are some examples: National Trust Bylaws
Some areas of the coast are watched over by the Coastguard, if you are told by the coastguard in their official capacity to do something then quite simply you have to do it. Every year tourist get into trouble because they didn't follow a few simple safety rules - don't become a statistic!!!
Sadly some bylaws forbid you from removing anything from a beach, such laws were possibly intended to stop the wholesale removal of sand and stones which might be used for building ect but you would still be in breach of those laws even if you took a single souvenir shell and you would be open to being fined.
Always be aware and obey local bylaws - Ignorance is no defence in the eyes of the law.
Basically don't do anything which is going to harm the places that are important to the environment the flora and fauna it contains and the place where we as rock poolers enjoy being.