Mark Coles profiles sculptor and installation artist Cornelia Parker, this year's official election artist. Parker's work has involved spectacular acts of destruction, from flattening brass band instruments, to dismantling old barns and blowing up sheds. As Parker roams the country observing the election campaign, Coles speaks to her friends and peers about how she went from a childhood spent in rural Cheshire where she struggled to fit in, to Turner Prize-nominated artist.