| G1900 Modelling Specification | Specification of modelling requirements for the geographic extent including specification for minimum acceptable detail and frequency of updates. | G19 | No | TBC | 27-04-2021 |
| G1900 Modelling Specification | Specification of modelling requirements for the geographic extent including specification for minimum acceptable detail and frequency of updates. | G19 | No | | 31-08-2021 |
| G1900 Modelling Specification | Specification of modelling requirements for the geographic extent including specification for minimum acceptable detail and frequency of updates. | G19 | No | | 05-09-2022 |
| G1900 Modelling Specification | Specification of modelling requirements for the geographic extent including specification for minimum acceptable detail and frequency of updates. | G19 | No | TBC | 09-09-2022 |
| G1900 Modelling Specification | Specification of modelling requirements for the geographic extent including specification for minimum acceptable detail and frequency of updates. | G19 | No | PM_40_30_55 | 11-04-2023 |