| 28K5656 | U1725 | MINISTRY OF DEFENCE AIR DOMESTIC R FERENCE NUMBER USE ONLY |
| BS2SP7ZG | U1904 | BRUNTONS AERO PRODUCTS LTD |
| SP7 | K7766 | BRITISH STANDARDS INSTITUTION |
| SP7-ZG | K7766 | BRITISH STANDARDS INSTITUTION |
| SP7ZG | K7766 | BRITISH STANDARDS INSTITUTION |
| ZG | K7766 | BRITISH STANDARDS INSTITUTION |