| RADON Barriers | A.PROCTOR GROUP LTD |
| CAVITY TRAYS LTD |
| CORDEK LTD |
| DELTA MEMBRANE SYSTEMS LTD |
| FOAMGLAS UK |
| NEWTON WATERPROOFING SYSTEMS |
| NORMET UK LTD |
| SOVEREIGN CHEMICALS LTD |
| TRITON SYSTEMS |
| WYKAMOL GROUP LTD |
| RADON Cavity Barriers | CAVITY TRAYS LTD |
| DELTA MEMBRANE SYSTEMS LTD |
| TIMLOC BUILDING PRODUCTS |
| WYKAMOL GROUP LTD |
| RADON Gas Evacuation | CAVITY TRAYS LTD |
| CORDEK LTD |
| RADON Mitigation Fans | DELTA MEMBRANE SYSTEMS LTD |
| RADON Protection Systems | A.PROCTOR GROUP LTD |
| ARDEX UK LTD |
| CAVITY TRAYS LTD |
| CORDEK LTD |
| DELTA MEMBRANE SYSTEMS LTD |
| NEWTON WATERPROOFING SYSTEMS |
| SOVEREIGN CHEMICALS LTD |
| TRITON SYSTEMS |
| WYKAMOL GROUP LTD |
| RADON Sumps | A.PROCTOR GROUP LTD |
| CAVITY TRAYS LTD |
| CORDEK LTD |
| DELTA MEMBRANE SYSTEMS LTD |
| TIMLOC BUILDING PRODUCTS |
