I prefer the term bird diet as that suggests some thought and expertise has gone into its preparation. Bird food has a bit of a throw away feel to it.
At Haith's, it's definitely a bird diet (even if we do call it bird food) and there's nothing half-hearted about the compilation of the ingredients as they're purchased, cleaned, blended, packed and then despatched all from under one roof, which makes sense given that it reduces the amount of carbon created when manufacturing is outsourced.
The investment to create The Bird Food Centre in Lincolnshire was an investment in wildlife welfare as the key driver was quality control and that was partly why receiving an award from BIAZA (British and Irish Association of Zoos and Aquariums) was so special as it was for the category of Animal Breeding, Care & Welfare. It's excellent to be acknowledged by experts in international conservation and by the very same zoo association that are responsible for rearing rare and endangered species of birds.
I think it's true that no two bird foods are created equal, but also, that cleanliness is next to godliness when it comes to providing safe bird foods/bird diets for Britain's wonderful wild birds.