This is part of my job, yay!
If your food or drink product has 2 or more ingredients (including any additives), you must list them all. Ingredients must be listed in order of weight, with the main ingredient first.
Ingredient quantities
You also have to show the percentage of an ingredient if it is:
highlighted by the labelling or a picture on a package, for example ‘extra cheese’
mentioned in the name of the product, for example ‘cheese and onion pasty’
normally connected with the name by the consumer, for example fruit in a summer pudding.
Food labelling guidance
Guidance on butter and cheese exemptions can be found here
Milk
40. The rules do not name the animal origin of milk because the word ‘milk’ includes milk from mammals such as cow, sheep, goat, and buffalo etc. It should be noted that all mammalian milk proteins have a similar structure and if someone has an allergy or intolerance to cows’ milk, they are likely to be allergic or intolerant to other mammalian milk. Therefore all milk and milk products (including lactose) need to be declared when used as an ingredient or a processing aid unless exempt (see p11-12 for exemptions).
41. Milk products such as cheese, butter, fermented milk and cream do not have to have an ingredients list, where no other ingredients have been added other than lactic acid, food enzymes and microbiological cultures and (in the case of cheese) salt. In order to ensure that consumers still receive the information they need to clearly identify the presence of milk in such cases, the following advice may be applied. The use of sales names such as ‘cheese’, ‘butter’, ’cream’ and ‘yoghurt’ is considered to refer clearly to the milk because legally these products can only be made from mammalian milk (EU Council Regulation No. 1308/2013 on Dairy designations). In such cases, further reference to ‘milk’ is not necessary because the Dairy designations protect such products. Therefore, cheese, butter, cream and yoghurt can be emphasised within the ingredients to demonstrate the presence of a milk product. The British Retail Consortium (BRC) and Food and Drink Federation (FDF) guidance provides best practice advice on this area and a literal interpretation of the EU FIC where all milk products have a clear reference to milk regardless of whether it is a protected term or not.