The Access Code says:
Low-ground shooting can take several forms. Pheasant and partridge shooting takes place during the autumn and winter in woods and forests, and on neighbouring land. Wildfowl shooting, such as for ducks, also takes place in the autumn and winter, usually on the foreshore or on land close to water and usually around dawn and dusk. You can help minimise disturbance by being alert to the possibility of shooting taking place in these areas during the autumn and winter and by taking account of advice on alternative routes. Avoid crossing land when shooting is taking place. Avoid game bird rearing pens and keep your dog under close control or on a short lead when close to a pen.