Prepare to meet your friendly neighbourhood guerrilla knitters, whose prime objective is to enliven the dull city streets with a riot of colour one stitch at a time. These creative knitting ninjas transformed a ballerina outside the Royal Opera House with their woolly works of art and installed a 13-ft spider's web, replete with trapped insects and fairies, in a tunnel beneath Waterloo station. These photographs of their exquisite feats will ensure you never see knitting or London the same way again. Deadly Knitshade is the founding member of London's Knit the City graffiti knitting group. Colour photographs