- I S Enterprises International - Colchester
- Identilabel Ltd - Colchester
- Impact Coatings Ltd - Colchester
- Impact Security & Medical Services Ltd - Colchester
- Incar Solutions UK - Colchester
- Indasa - Colchester
- Ingleton Wood - Colchester
- Inkpen Downie Architecture & Design Ltd - Colchester
- Inn-House Technology - Colchester
- Intelligent Mist - Colchester
- ITG Instructor Training Limited - Colchester
- J J Prior Ltd - Colchester
- JackNbox Ltd - Colchester
- John Whiting - Colchester
- Jones & Whymark Engineering Ltd - Colchester
- Kayson Green Ltd - Colchester
- KDH Ltd - Colchester
- Kennedy Grinding Limited - Colchester
- Kent Blaxill & Co. Ltd - Colchester
- Keystone Asset Management Solutions - Colchester
- Kings Chandelier Services Ltd - Colchester
- Kings Seeds - Colchester
- KP Seating - Colchester
- L S Industrial - Colchester
- Lapsafe - Colchester
- Layer Products Canopies Ltd - Colchester
- Lenz Security - Colchester
- Leppard & Martin - Colchester
- Lightbox Direct - Colchester
- Lining Systems GRP Ltd - Colchester
- Links Network Communications Ltd - Colchester
- Lubron UK Limited - Colchester
- Lyteze Products Ltd - Colchester
- M A P Fabrications Ltd - Colchester
- M G E - Colchester
- M Greene Ltd - Colchester
- M S X International Ltd - Colchester
- Maddisons UK Ltd - Colchester
- Madson Air Conditioning Ltd - Colchester
- Marel - Colchester
- Marfleet and Blyth Ltd - Colchester
- Mersea Trailers and Snipe - Colchester
- Metallic Elephant - Colchester
- Mezzanine Floor Engineering Ltd - Colchester
- MFE Glass Partitioning - Colchester
- Micro Scooters Ltd - Colchester
- Milbank Concrete Products Ltd - Colchester
- Milfab - Colchester
- Monthind - Colchester
- Multitek Ltd - Colchester
Companies 101 to 150
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