- A5 Hydraulics Ltd - DL1 2NG
- AMP Consultants - DL1 4wd
- Asbestos Control & Abatement Division - DL1 4QB
- Avant Roofing - DL1 2NG
- Blake Newport Associates Ltd - DL1 5RF
- Blake Telecom - DL1 5SF
- Braddan Plant Hire Ltd - DL1 2PB
- Carmel Structures Ltd - DL1 1LA
- CGK Trading Ltd - DL1 1LA
- Chetaru UK Ltd - DL1 1GL
- Cleveland Studios Ltd - DL1 4GD
- Colour P V C-u Ltd - DL1 4WG
- County Groundworks Ltd - DL1 4JD
- Cummins - DL1 4PW
- Darlington Farmers Auction Mart - DL1 5DU
- Direct Signs (Northern) Ltd - DL1 2PT
- Electronic Security Solutions Ltd - DL1 1QE
- Epcot Cubicles - DL1 2UP
- Floors 4 Home - DL1 1LA
- Forge House Group Ltd - DL1 2PB
- FPE Seals - DL1 4WF
- Harvey and Hugo Ltd - DL1 1GL
- HB Roadways - DL1 4ET
- Henry Williams Limited - DL1 2NJ
- James Winter Builders - DL1 4HX
- MASSTA UK - DL1 4QR
- MicroSlat International Ltd - DL1 4PQ
- M-machine - DL1 2PJ
- Monaghans Auto Accessories - DL1 2EJ
- Northgate plc - DL1 4DY
- Northgate Vehicle Hire - DL1 4PZ
- Northview Engineering Group - DL1 2PB
- Phase One - DL1 2RZ
- Pollite - DL1 1SW
- Pure E D M Ltd - DL1 4PJ
- Quaker Scaffolding - DL1 1XE
- Recruitrite UK - DL1 1GL
- Resin Crew - DL1 1LP
- Resisystems - DL1 2SE
- S & I Structures - DL1 2PJ
- Salon Services Ltd - DL1 4PJ
- Signature (Fencing and Flooring) Systems Europe - DL1 2BJ
- Skylamp Solar - DL1 1LP
- Smith & Allan - DL1 1QE
- Standing Stone Drawing Office Supplies Ltd - DL1 4PJ
- Synergy Renewable Energy Ltd - DL1 2PL
- T E P Electrical Distributors Ltd - DL1 1QF
- Tarmacadams Ltd - DL1 1HN
- Trophycentre.com - DL1 1UB
- Validair Diamond Scientific - DL1 1GY
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