- Lemsford Metal Products (1982) Ltd - AL7 3UQ
- LS Fabrications Ltd - AL7 1JD
- Marcoe Electrical - AL7 1GX
- Martin-woolman Ltd - AL7 1HG
- Mercury Security Systems - AL7 1JG
- Meteor Communications - AL7 1JG
- Metro Fixings Ltd - AL7 1BD
- Miniplas Ltd - AL7 4TW
- Mirage Health Group - AL7 3AX
- N L A Services Ltd - AL7 1EP
- NVELOPE Rainscreen Systems Ltd - AL7 1AD
- Omega Citylifts Services Ltd - AL7 1JG
- Pacehigh Limited - AL7 1LT
- Pakex (UK) PLC - AL7 1FE
- PHS Interclean - AL7 1HG
- Predator Motor Sport - AL7 1EP
- Rack Storage Systems Ltd - AL7 4SS
- Roadmaster Concrete Mixers - AL7 4SS
- Robert P D Frost & Co Ltd - AL7 4SS
- Rotech Machines Ltd - AL7 1AJ
- S J Engineering Ltd - AL7 1JU
- Sevarg Engineering Ltd - AL7 1AP
- Sigma Imaging UK Ltd - AL7 1EW
- Sika Ltd - AL7 1BQ
- Silver Fox Ltd - AL7 1SA
- Silverstream Engineering Ltd - AL7 1JU
- Smartvisual - AL7 1TS
- Step Hear - AL7 1SB
- T J Fire - AL7 1HG
- TM Robotics - AL7 2AA
- Unicut Precision Limited - AL7 1AU
- UnivoxAudio Ltd - AL7 2QF
- VSL (Voice Services Ltd) - AL7 1HG
- Welwyn Tool Group Ltd - AL7 1EW
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