Convenience breakfast brand Rumblers from Irish company Ennis Foods is striking back at Kellogg's To Go Twinpots with the launch of Rumblers Weekend, which contains two cereal plus milk breakfasts. Ennis Foods chairman Richard Penston said the secret to Rumblers success was in the quality and taste of its milk ­ it uses the Millac Maid brand ­ which would help fight what he terms the David and Goliath battle against the brand name and mighty budgets of Kellogg. {{MARKETING - P&P }}