- Legionella Control International - Manchester
- Lex Business Equipment Ltd - Manchester
- Leyland and Birmingham Rubber - Manchester
- Libra Speciality Chemicals Ltd - Manchester
- Lighthouse Acoustics - Manchester
- Linco Care Ltd - Manchester
- Lincocare Ltd - Manchester
- Linen Towels - Manchester
- Liquid Personnel - Manchester
- LK Group - Manchester
- LK Industrial Covers - Manchester
- Logstrup (UK) Ltd - Manchester
- Longworth Limited - Manchester
- Loomland - Manchester
- Lowbury Construction Ltd - Manchester
- Luton Engineering Services S W Ltd - Manchester
- Luxury Flooring Manchester - Manchester
- M & A Brown Signs - Manchester
- M & P (Engineering) Ltd - Manchester
- M & S Commercials Ltd - Manchester
- M Comar & Sons Ltd - Manchester
- M G F Trench Construction Systems Ltd - Manchester
- M G Gilligan Ltd - Manchester
- M S M Group - Manchester
- M S S Products - Manchester
- M&I Materials Ltd - Manchester
- M&M Controls - Manchester
- M2 Digital - Manchester
- M247 - Manchester
- MACS Automated Bollard Systems Ltd - Manchester
- Magic Box Ltd - Manchester
- Mak Integrated Security Services - Manchester
- Malibu Corporation Ltd - Manchester
- Manchester Builders & Construction - Manchester
- Manchester Catering Company Ltd - Manchester
- Manchester Clothing Company Ltd - Manchester
- Manchester Doors & Cubicles - Manchester
- Manchester Electric - Manchester
- Manchester Pest Control - Manchester
- Manchester Refractory - Manchester
- Mandata Contracts Ltd - Manchester
- Manplas Ltd - Manchester
- Mansam Products Ltd - Manchester
- Manuli Hydraulics - Manchester
- Maritime - Manchester
- Markem Imaje Ltd - Manchester
- Mat Creations Ltd - Manchester
- Mathers Foundry - Manchester
- Matrix Graphic Sales Ltd - Manchester
- McBride - Manchester
Companies 501 to 550
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