| COLUMNS Cast Iron | FSE FOUNDRY |
| COLUMNS Cast Stone (Reconstructed Stone) | AGGREGATE INDUSTRIES - STRUCTURAL PRODUCTS |
| FORTICRETE WALLING & CAST STONE |
| PROCTER CAST STONE |
| COLUMNS Exterior | PORTLAND STONE FIRMS LTD |
| COLUMNS Front Door | WESSEX BUILDING PRODUCTS LTD |
| COLUMNS Glulam | CANADA WOOD UK |
| HOWARTH TIMBER GROUP |
| COLUMNS GRP | WESSEX BUILDING PRODUCTS LTD |
| COLUMNS Portland Stone | PORTLAND STONE FIRMS LTD |
| COLUMNS Precast Concrete | FORTERRA BUILDING PRODUCTS LIMITED |
| HOLCIM AGGREGATES UK |
| PRECAST CONCRETE STRUCTURES LTD |
| COLUMNS Stone | PORTLAND STONE FIRMS LTD |
