KAREN Turpie stops for a second and chews on the words. “I am forever grateful for it,” the mother-of-five eventually settles on, looking across her living room and towards her guest. “You’ve not just made a difference to me. You’ve made a difference to all of us.“ It’s Thursday morning in Dalmarnock and in a house hidden away at the end of a cul-de-sac under the watchful eye of Celtic Park she’s speaking to David Cairns for the first time. The “it” Karen, a shop assistant, is grateful for is quite simple: fruit and vegetables. Her family is one of nearly 60 in the city benefiting from a new scheme brought to the East End by David which hands out vouchers to locals to exchange for free boxes of the good stuff and a delivery has just arrived when she sits down to speak with him and the