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)
Unit G3, Knights Park Industrial Estate, Knight Road, Strood, ME2 2LS

Total Score: (lower is better)
Unit 2, Ballard Industrial Centre, Revenge Road, Lordswood, ME5 8UD

Total Score: 0 (lower is better)
PERFECT HYGIENE RATING SCORE
Chatham Maritime Marina, Leviathan Way, Chatham Maritime, Chatham, ME4 4LP

Total Score: (lower is better)
Grapes Direct, Fort Bridgewood, Rochester, Medway, ME1 3DQ

Total Score: (lower is better)