I have been feeding them in my garden for about 18 months. I always give them leftover wet food & some cat biscuits - usually anything my cats won't eat so the hedgies actually eat better than the cats as they end up with RC, JWB etc. At the moment, they are having PAH own brand premium light. One thing I would question about the article is the fat content of their diet. It says to give then cheapo food as its higher fat but the hedgie sites always say light catfood is better for them as regular is too high fat and they can gain too much weight. I would start giving them higher fat food from october to help build up their fat store for the winter.
Always make sure they have a shallow bowl over water out as well, especially if feeding them dry food.