upate license to OGL in model card

README.md

@@ -27,7 +27,7 @@ FastNet has an encode-process-decode structure with a series of graph neural net
 
 - **Developed by:** Met Office & The Alan Turing Institute
 - **Model type:** Encoder-processor-decoder model
-- **License:** These model weights are published under a Creative Commons Attribution 4.0 International (CC BY 4.0). To view a copy of this licence, visit [https://creativecommons.org/licenses/by/4.0/](https://creativecommons.org/licenses/by/4.0/). The corresponding inference scripts are released under the under the GNU Affero General Public License (AGPL) v3.0.
+- **License:** British Crown copyright 2025, the Met Office. Model weights are made available under the Open Government Licence (OGL) v3.0; to view a copy of this licence, visit https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/. The corresponding inference scripts are licensed under the GNU Affero General Public License (AGPL) v3.0.
 
 ### Model Sources