Kellogg has successfully implemented the first price hike for two years across its portfolio. The price of Corn Flakes had increased by 4p for a 500g pack at six of the chains visited in The Grocer 33 survey this week (p33). The hike pushes up the cost of breakfast, coming as it does three weeks after a pint of milk rose 1p. A Kellogg spokesman confirmed that this was a manufacturer increase. Other Kellogg products are also affected.