This week Britain put real money behind sovereign AI — £500m for a new investment unit, £80m in procurement, plus a North East Growth Zone — while a parallel set of stories exposed the strain underneath. Anthropic's Mythos cyber-capable model leaked through unauthorised contractor access in the same week the FCA put eight major firms into AI live testing and the Bank of England summoned lenders. The result is a country trying to be a frontier player and a cyber guardian simultaneously, with departments openly contradicting each other on the energy maths.

Key stories:

- £500m UK Sovereign AI Unit launches with first equity in Callosum

- Anthropic Mythos unauthorised access spreads through banks and NCSC

- Google commits up to $40bn to Anthropic at a $350bn valuation

- AISI's Jade Leung: every frontier model tested has live vulnerabilities

- DSIT and DESNZ split tenfold on AI datacentre energy projections

- FCA names eight firms for second AI Live Testing cohort

- Sunak: scrap National Insurance as AI flattens youth jobs

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