It's a difficult one! Seagulls are large, overbearing and opportunists. The way they now swoop down and literally take the food out of your mouth is because over the years people have fed them, myself as a child in Cornwall included. They're big strong aggressive, frightening birds, with no natural enemies and have become a blasted nuisance, terrifying young and old with impunity. Like all overpopulated creatures they need culling. Not sure how without incurring howls of protest and rage, so unless someone faces up to the problem nothing can be done to alleviate it. We have the same problem with Magpies! However, farmers have their own way with dealing with this overpopulation, not particularly pleasant, but our song birds are now flourishing! I do put bits and bobs out for our wild life, but always well away from the garden - I don't want any furry visitors in the house, they're wild animals and should never be encouraged near the home. My dog is a spaniel and only good for picking up! not ratting!