| ROOF VALLEYS Troughs | CAVITY TRAYS LTD |
| FILON PRODUCTS LTD |
| GUTTERMASTER LTD |
| HAMBLESIDE DANELAW LTD |
| KLOBER LTD |
| ROOF VALLEYS Troughs AGREMENT CERTIFICATE HOLDERS | FILON PRODUCTS LTD |
| HAMBLESIDE DANELAW LTD |
| ROOF VALLEYS Troughs Aluminium | GUTTERMASTER LTD |
| ROOF VALLEYS Troughs Aluminium Purpose Made | GUTTERMASTER LTD |
| ROOF VALLEYS Troughs Copper | MATTHEW HEBDEN |
| METAL GUTTA |
| ROOF VALLEYS Troughs GRP | CAVITY TRAYS LTD |
| FILON PRODUCTS LTD |
| HAMBLESIDE DANELAW LTD |
| KLOBER LTD |
| MARLEY LTD |
| ROOF VALLEYS Troughs GRP / Gutters GRP Dry Fix | FILON PRODUCTS LTD |
| HAMBLESIDE DANELAW LTD |
| KLOBER LTD |
| ROOF VALLEYS Troughs GRP BS 476 Part 3 | FILON PRODUCTS LTD |
| KLOBER LTD |
| ROOF VALLEYS Troughs GRP BS 5534 | CAVITY TRAYS LTD |
| ROOF VALLEYS Troughs Simulated Lead | CAVITY TRAYS LTD |
| FILON PRODUCTS LTD |
| KLOBER LTD |
