Kate Quilton explores how department store John Lewis, long-time pillar of middle-class UK, famed for wedding lists and its much talked-about Christmas adverts, has found itself battling against cut-price upstart Primark, with its hit homeware ranges and viral beauty dupes. As wallets tighten, people want a cheap pick-me-up - a lipstick, a quirky mug, a cosy blanket - and these two giants of the high street are going all out to deliver