M&S Honey Nut Corn Flakes has the most, with 26.6g per 100g, or 8g in a 30g serving. 14 of the 69 M&S cereals have no free sugar at all. Below are all 69 ranked from most to least free sugar, in seven groups.
All 9 M&S cereals in this group, ranked from most to least free sugar. M&S Honey Nut Corn Flakes comes first with 26.6g of free sugar per 100g and M&S Only 1 Ingredient Corn Flakes comes last with 0g of free sugar per 100g.
All 9 M&S cereals in this group, ranked from most to least free sugar. M&S Choco Hazelnut Pillows comes first with 22g of free sugar per 100g and M&S Only 5 Ingredients Multigrain Hoops comes last with 3.8g of free sugar per 100g.
All 6 M&S cereals in this group, ranked from most to least free sugar. M&S Bran Sticks comes first with 12.3g of free sugar per 100g and M&S Only 3 Ingredients Bran Flakes comes last with 2.1g of free sugar per 100g.
All 11 M&S cereals in this group, ranked from most to least free sugar. M&S Made Without 4 Nut & Flame Raisin Granola comes first with 16.5g of free sugar per 100g and M&S No Added Sugar Seed & Nut Granola comes last with 0g of free sugar per 100g.
All 8 M&S cereals in this group, ranked from most to least free sugar. M&S Mixed Berry Muesli comes first with 7g of free sugar per 100g and M&S No Added Sugar Swiss Style Muesli comes last with 0g of free sugar per 100g.
All 7 M&S cereals in this group, ranked from most to least free sugar. M&S Triple Chocolate Crunch comes first with 21.7g of free sugar per 100g and M&S High Protein Vegan Chocolate Crunch comes last with 5.7g of free sugar per 100g.
All 19 M&S cereals in this group, ranked from most to least free sugar. M&S Cafe Latte Porridge comes first with 15.1g of free sugar per 100g and M&S Traditional Whole Oats comes last with 0g of free sugar per 100g.
Cereals are ranked by free sugar per 100g, not total sugar. Free sugars are the sugars NHS daily limits apply to: added sugar, honey, syrups and fruit juice. Sugar that comes from whole or dried fruit and from milk is not free sugar, so a fruit muesli can have plenty of total sugar but less free sugar.
Boone works out free sugar from the ingredients list and nutrition panel on Ocado's M&S listings. The percentages are for a 30g serving against the daily limit for the age you pick: 30g for anyone 11 or over, 24g for 7 to 10 year olds and 19g for 4 to 6 year olds. Milk is not included.