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: (lower is better)
50 High Street, Holme Upon Spalding Moor, York, YO43 4EN

Total Score: 10 (lower is better)
48-50 Market Place, Pocklington, York, YO42 2AH

Total Score: 10 (lower is better)
4 Market Place, Hedon, Hull, HU12 8JA

Total Score: 15 (lower is better)
33 Queen Street, Bridlington, East Riding Of Yorkshire, YO15 2SN

Total Score: 20 (lower is better)