- Careline 365 - Knebworth
- Hamilton Billiards & Games - Knebworth
- Hertford plumbers - Knebworth
- I W L Contractors Ltd - Knebworth
- Imatek - Knebworth
- Indigoplum - Knebworth
- M D M Blinds Ltd - Knebworth
- Moduloc Control Systems Ltd - Knebworth
- Nobilla - Knebworth