Remember that recipes change occasionally. Some supermarkets produce lists of their own-brand products free from milk. Many people find these invaluable. Some people assume that vegetarian cheese is milk-free. This is not the case.
Milk products can turn up in unexpected places.
A child had a mild reaction when he ate food from a plate washed in Ecover washing-up liquid. Ecover contains a milk product. Ask for a company nutritionist. This databank provides product information relating to milk, egg, wheat, soya, BHA and BHT, sulphur dioxide, benzoate and azo colours. To take advantage of this service, see your GP, who should refer you to a registered dietitian.