A university has done a study and apparently the best way to stop a seagull from nicking your food is to stare at it! Good luck trying that on a bugger the size of a chicken swooping in on your piece of fish/chips/pies etc. at about fifty mph. Try giving that a 'Paddington hard stare' and see how you get on!
www.bbc.co.uk/news/uk-49261385
www.bbc.co.uk/news/uk-49261385