By Laura McGuire Primark ownerAssociated British Foods reported a 2.8 per cent boost in revenues to £6.8bn in the fourth months to January, as shoppers sought out cheap clothing. In an update to markets, the British firm said retail sales grew 7.3 per cent to £3.3bn thanks to a collaboration with pop-star Rita Ora. The firm did warn at the start of winter that demand for warm clothing was initially slower due to unseasonable weather but trading has now picked up as the country is hit by a cold snap. Primark’s market share in clothing, footwear and accessories grew to 7.1 per cent, up 0.1 perce…