According to the Ocado website, these are the ingredients (which you will already know as you have the packet)
Cereals (Whole Oats {43%}, Barley {33%}, Whole Rye {11%}), Sugar, Flavouring, Emulsifier (Soy Lecithin), Niacin, Iron, Vitamin B6, Vitamin B2 (Riboflavin), Vitamin B1 (Thiamin), Folic Acid, Vitamin D, Vitamin B12
As there is added sugar, it might not be a B choice. I think that the cereals which are B choices don't have added sugar.