| 28Q18798 | U1725 | MINISTRY OF DEFENCE AIR DOMESTIC R FERENCE NUMBER USE ONLY |
| 412 | K7766 | BRITISH STANDARDS INSTITUTION |
| DEFSTAN53-92PT1 | K0851 | MINISTRY OF DEFENCE DIRECTORATE OF STANDARDIZATION STAN 1 |
| NL5051 | K4358 | SAFRAN ELECTRICAL & POWER UK LTD |
| SP76-412 | K5974 | ROLLS-ROYCE PLC NAVAL MARINE |
| SP76 | K7766 | BRITISH STANDARDS INSTITUTION |
| SP76-412 | K7766 | BRITISH STANDARDS INSTITUTION |