The Access Code says:
Access rights extend to these places but remember that they are carefully managed for nature conservation and to safeguard rare animals and plants. Take care to avoid damaging the site or disturbing its wildlife, or interfering with its management or enjoyment by others. Depending on your activity, you might be requested to follow a specific route or to avoid exercising access rights in a specific area. Following such local guidance can help to safeguard the natural heritage of these areas.