- The Membrane Keyboard Company - Unit 2, Fareham , Hampshire, P014 1AH
- The Menu Shop - 38 High Street, Warminster, Wiltshire, BA12 9AF
- The Merc Medics - Unit B1, Send Business Park, Woking, Surrey, GU23 7EF
- The Metallic Wool Co Ltd - Bredgar Road, Gillingham, Kent, ME8 6PL
- The Metals Warehouse - Redfield Road, Nottingham, Nottinghamshire, NG7 2UJ
- The Microfilm Shop - 15 Hammond Close, Nuneaton, Warkickshire, CV11 6RY
- The Mill - 11-14 Windmill Street, London, Greater London, W1T 2JG
- The Milne Partnership - Mill Works, Rectory Road, Dereham, Norfolk, NR20 4PA
- The Mobile & Outside Caterers Assoc GB Ltd - Association House, Solihull, B90 1AG
- The Mobility Furniture Company Ltd - 4 Cranwell Road, Weston-super-Mare, Somerset, BS24 7GF
- The Modern Fireplace Company & Monumental Works - Cecil Street, Newry, Co. Down, BT35 6AU
- The Monk Bridge Construction Co. Ltd - Unit B2 Elvington Industrial Estate, York Road, York, North Yorkshire, YO41 4AR
- The Monmouthshire Window Company - 164 Newport Road, Caldicot, Monmouthshire, NP26 4AA
- The Moray Council Fleet Services - Ashgrove Depot, Elgin, Morayshire, IV30 1UU
- The Morton Partnership Ltd - 11 Market Place, Halesworth, Suffolk, IP19 8BA
Companies 1876 to 1890 | Page 126 of 273