Here's a list of businesses (and their ratings) in the Manufacturers/packers category.
In England, Wales and Northern Ireland food hygiene ratings are provided by the The Food Hygiene Rating Scheme (FHRS). Ratings in Scotland are provided by a similar scheme called the Food Hygiene Information Scheme (FHIS).
You can read more about FHRS and FHIS food ratings here.
Click on a establishment below for more information:

Total Score: 5 (lower is better)
Vitality House, Sixth Avenue, Burton upon Trent, DE14 2WP

Total Score: 15 (lower is better)
Town End Farm, Uttoxeter Road, Beamhurst, Uttoxeter, ST14 5EA

Total Score: 5 (lower is better)
Kerry Foods Limited, 76 Mosley Street, Burton upon Trent, DE14 1DS

Total Score: (lower is better)
30 The Maltings, Uttoxeter, ST14 7LN

Total Score: 10 (lower is better)