i used to work with a guy who had a mean but effective way of dealing with pigeons, he used to buy bird seed damp it and then add bicarbinate of soda to it and then dry it on the window sill once dry used it to feed the pigeons, apparently this kills them, havent tried it as there is very few pigeons near me but plenty of blackbirds so im buying fruit net next week ready, but he swore blind that it worked, there was always a few dead pigeons near where we worked, a guy who lives near my sister keeps pigeons and alway seems to let them out after her oh has just washed the car, and as he works shift the car gets washed at random times, so her oh is contemplating shooting them.