- AAC - AL7 1GX
- Abbey Stationers Ltd - AL7 3UW
- Air Curtain Design - AL7 1EN
- Any Foam - AL7 1TW
- AnyFoam - AL7 1TW
- Apex Grange - AL7 1EW
- Aurora Lighting - AL7 4SW
- Avoncraft - AL7 4TW
- Binding Store Ltd - AL7 1AD
- BlackBlue - AL7 4SW
- Brillianz Electronic Systems Ltd - Welwyn Garden City - AL7 1BJ
- British Lead Mills - AL7 3UB
- Briton & Ensign Ltd - AL7 1JQ
- Brogan Group - AL7 1TW
- C N Bio Innovations - AL7 3AX
- Cambridge Image Technology Ltd - AL7 1AD
- Capital Belting - AL7 4TW
- Carl Zeiss Ltd - AL7 1JQ
- Carlisle Support Services - AL7 1TW
- CBM Electrical Contractors Ltd - AL7 1AU
- Central Compressor Services Ltd - AL7 4SR
- Chapman Ventilation Ltd - AL7 1JG
- Cleamax Engineering Ltd - AL7 3UQ
- Comelit - AL7 1GX
- Company Telecom - AL7 1NJ
- Crystal Drain Maintenance Services Ltd - AL7 1JG
- CSA Consulting Engineers Ltd - AL7 1TW
- Duncan Print & Packaging Ltd - AL7 1EU
- EasyMix Concrete Ltd - AL7 4SS
- Elder Engineering (Herts) Ltd - AL7 1LT
- Finetech Medical - AL7 1AU
- G S D Security UK Ltd - AL7 3DD
- Gas & Environmental Services Ltd - AL7 2BH
- GCT - AL7 1BJ
- Geemarc Telecom Ltd - AL7 1SB
- Genie C C T V - AL7 1LT
- Gilbertson & Page Ltd - AL7 1AN
- Grafique UK - AL7 1HU
- H L S Structural Engineers Ltd - AL7 1AN
- Hadley Wood Joinery - AL7 4ST
- Hamamatsu Photonics UK Ltd - AL7 1BW
- Henleys Medical Supplies Ltd - AL7 1AN
- Holmwood Leasing Ltd - AL7 4SS
- IC Lighting Ltd - AL7 1AN
- Imedco - AL7 3UQ
- Jab Group Ltd - AL7 9FZ
- Jardak - AL7 1BW
- Jeol UK Ltd - AL7 1LT
- Kane International Ltd - AL7 1JG
- Kladfix Ltd - AL7 1AD
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