UK Food Standards Agency
Data is sourced from the English, Scottish, Welsh and Northern Irish agencies which in turn is supplied by participating local authorities.
The information is typically accessed via the more detail screen and then by selecting "Food Hygiene" or from a menu button as displayed in the above image.
When selected from the more screen more than one choice may be be presented as sometimes ambiquity arises when trying to match the entry from the business listing with those from the FSA.
The API can be obtained via their website.