Answer:
This isn't a food sold in the US, so I'm not as familiar with it.
Looking at the ingredients, it seems to be a decent food, though the fact that the second ingredient is wheat is concerning, though it could be there just as a binder. It does make the fiber content high, I usually try to stay around 3% or less. I'd also prefer to see something with a few more meat ingredients. Perhaps you could supplement with raw meat/ meat soups.
http://www.petsathome.com/shop/nugget-ferret-food-2kg-by-pets-at-home-15672
Ingredients: Chicken Meal (Min 37%), Wheat, Herring Meal, Poultry Fat, Linseed, Beet Pulp, Maize, Dried Egg, Fructo-Oligosaccharides.
Moisture 9%, Protein 36%, Oils and Fats 19%, Fibre 4%, Ash 9.5%.