Doh!' At least, that's what Kellogg's hopes envious rival manufacturers will be saying when it starts serving up Bart Simpson cereal this month. The cereals giant has signed up the yellow cartoon character and his dysfunctional family to launch No ProblemOs, frosted multi-grain cereal loops and Simpson shaped mini biscuits which feature the show's favourite characters. Kellogg's said it plans to support the newcomer with a £1m marketing spend which will feature TV ads animated by the show's creators. The new cereal will be available from February 25 and is set to come complete with bright packaging and a puzzle to keep kids entertained at breakfast time. Rsp: £1.79, 350g box. Meanwhile, Kellogg's has teamed up with experiences company Red Letter Days for a new promotion on adult cereals Crunchy Nut Red and Crunchy Nut cornflakes. A £50,000 prize package is offering more than 150 days out including activities from daredevil Ferrari driving, white water rafting and tandem sky-diving to relaxing and indulgent visits to top hotels and beauty spas. The on-pack promotion runs until April. {{P&P }}