UK adoption stopped looking aspirational this week. HMRC scaled Microsoft Copilot to 28,000 staff, Lloyds put its Envoy agent platform into production, NatWest joined the ChatGPT app store, and councils across England rolled out planning and ambient-AI tools. The same week, sovereignty politics hardened, frontier safety findings sharpened, and the capital-markets picture split open.

Key stories:

- HMRC 28,000-seat Copilot rollout and Accenture's 743,000-employee deployment

- Lloyds Envoy agent platform, NatWest in ChatGPT, ASOS-Microsoft styling deal

- Kendall RUSI keynote, Rigby's "disjointed" critique, Ineffable's £830m UK seed

- Pentagon AI vendor list pointedly excludes Anthropic; Goldman bans it in Hong Kong

- AISI evaluations of GPT-5.5 and Claude Mythos; NCSC warns of an AI patch wave

- Hyperscaler capex hits £548bn; Microsoft-OpenAI exclusivity ends; Cerebras files IPO

- EU AI Act Omnibus trilogue stalls; OpenAI misses revenue targets; Musk v Altman opens

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