Reuters' article 'オープンＡＩ、英データセンター計画を一時停止 規制・エネ高騰で' directly supports the core claim: OpenAI said it was pausing the U.K. data-center project and would revisit it when regulation and energy costs better support long-term investment. Reuters also identifies the project as part of Stargate U.K. launched with Nvidia and Nscale. Yahoo Finance's 'OpenAI Pauses UK AI Tech Team-Up With Nvidia Over Energy Costs, Regulation' corroborates the same explanation and adds the specific scale of 'up to 8,000 GPUs.' The traced CNBC source matches the same framing, though it could not be directly fetched in this run.