We've covered vegan granola, porridge and muesli elsewhere on this site but this is a quick heads-up to mainstream supermarket-style breakfast cereals. It's not exhaustive but it will give you a few ideas!
So what makes a breakfast cereal NOT vegan? The most obvious things to look for are: Vitamin D (not usually vegan) added dairy, eg whey powder, milk, yoghurt; or honey.
But that still leaves plenty to choose from!
Aldi: Crisp Cereal - Apple & Cinnamon; Harvest Morn Fruit Wheats - Apricot or Blueberry; 'Has No' Gluten-Free Crisp Rice; Specially Selected Premium Muesli - Berries & Cherries or Exotic or Really Nutty; Harvest Morn Wheat Bisks
Asda: Popcorn Cereal - Toffee Apple or Caramel; Good Balanced Multigrain Granola - Fruity or Nutty; Free From Porridge or Muesli; Free From Instant Oats - Golden Syrup; Cornflakes; Wheats - Raspberry, Apricot or Blueberry; and more - click here
Co-op: Mixed Fruit Muesli; Whole Wheat Biscuits; Porridge Oats; Apricot Wheats; Blueberry Wheats; Oat Sachets - Original or Golden Syrup; Cherries and Berries Muesli; Fruit and Nut Muesli; Good Life Fruit Muesli
Kellog's: Fruit 'n' Fibre; Just Right
M&S: 3-Seed Granola; Cranberry & Pumpkin Seed Granola Mix; Made Without Rice Porridge; Made Without Wheat 7 Fruit, Nut & Seed Muesli: Instant Porridge - 10 Apple, Sultana & Cinnamon, Golden Syrup or Original; Simply Fruit And Fibre; Simply Fruit Muesli
Morrison's: Super Hoops; Mighty Malties; Wheat Biscuits (Savers and regular); Cornflakes; Fantastic Fibre; Bran Flakes (Savers and regular); Puffed Wheat; Sultana Bran; Strawberry & Raspberry Clusters; Maple & Pecan Clusters; Instant Oats - Original, Blueberry & Raspberry; Fruit & Flake; Coco Snaps; Muesli - Wholewheat or Extra Fruity; Sultana Bran; Mini Neat Wheats - Cranberry or Blueberry
Sainsbury's: Wholegrain Wheats - Apricot, Raisin, Red Cherry or Golden Syrup; Wholewheat Biscuits (Basics and regular); Wholegrain Malties; Wholewheat Muesli; Fruit and Nut Muesli; Pecan & Maple Crisp; Orchard Fruit Muesli with Cinnamon; Fruit Muesli; Fruit and Nut Muesli; Apple & Cinnamon Crisp; Luxury Fruit and Nut Muesli;Porridge; SO organic Porridge oats; 10 Express Porridge - Golden Syrup, Original, Apple & Cinnamon or Raspberry & Blueberry; Scottish Whole Rolled Chunky Oats; Scottish Porridge Oats; Scottish Porridge Oats with Oatbran & Wheatbran
Tesco: Tesco Wheat Biscuits - regular and Value; Apple & Cinnamon Muesli; Kids Cereals Cinnamon Squares; Fruit and Nut Muesli; 50% Fruit Muesli; Finest Muesli - Fruit & Nut; Berry & Cherry Muesli; Reduced Sugar Cranberry & Almond Granola; Apple & Blueberry Muesli; Nuts & Seeds Muesli; Six Nut Muesli; Maple and Pecan Crisp; Wheats - Apricot, Red Cherry, Golden Syrup, Raspberry, Raisin or Blueberry; Oatbran; Scottish Porridge Oats; Easy Oats - Original, Golden Syrup or Apple & Blueberry; Scottish Porridge Oats with Wheat bran; Organic Porridge Oats; Value Porridge Oats; Finest Scottish Porridge Oats; Oat and Barley porridge sachet
Waitrose: Wholewheat Biscuits; Porridge Oats; Essential Porridge Oats; Porridge Oats with Wheatbran; Wholegrain Wheats - Apricot, Malted or Blueberry; Coffee, Date & Chocolate Muesli; Organic Muesli; Pistachio, Raspberry, Apple & Apricot Granola; Mixed Berries Porridge Oats; Flower Petal Muesli; Instant Oats Golden Syrup or Original