Christopher Shannon's witty and sensitive interpretations of streetwear and street culture have made him a cherished member of London menswear's vanguard. His Spring/Summer 2013 collection presented this afternoon at The Old Sorting Office in Holborn featured many elements strengthening Shannon's signature for a sort of subsidiary utilitarianism with rucksacks, sturdy serges and rag-strewn helmets aided and not abetted by frayed edges and an embellishment formed from swatches of multicolour Peruvian rug.