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| TREDION GROUP LIMITED shared | · | · | active |
| TRIDENT GROUP SOLUTIONS LIMITED shared | · | · | active |
| TUKE AND BELL LIMITED shared | · | · | active |
| Turquoise Thinking Ltd shared | · | · | active |
| UBCIVILS LTD shared | · | · | active |
| UK GRID SOLUTIONS LIMITED shared | · | · | active |
| UK TEST INSTRUMENTS LIMITED shared | · | · | active |
| VISION CONSULTING LIMITED shared | · | · | active |
| VLL LIMITED shared | · | · | active |
| VOLKERFITZPATRICK LIMITED shared | · | · | active |
| VYSIION LIMITED shared | · | · | active |
| WALKER CONSTRUCTION (U.K.) LIMITED shared | · | · | active |
| WALKER MORRIS LLP shared | · | · | active |
| Ward & Burke Construction Limited shared | · | · | active |
| WATER RESEARCH CENTRE LIMITED shared | · | · | active |
| WILDHEARTS OFFICE LIMITED shared | · | · | active |
| WINN & COALES (DENSO) LIMITED shared | · | · | active |
| WIREMEK LIMITED shared | · | · | active |
| WYE VALLEY DEMOLITION LIMITED shared | · | · | active |
| YESSS (A) ELECTRICAL LTD shared | · | · | active |
| not named shared | · | · | active |