Fitch Ratings today affirmed its AAA ratings on the U.K.’s foreign currency issuer default rating, local currency issuer default rating, and country ceiling. The currency ratings outlooks were maintained as negative.
The agency seems to say that the country should be happy it didn’t adopt the euro:
The independent monetary policy framework, as well as sterling's reserve currency status, affords the UK higher financial and economic policy flexibility and debt tolerance than many of its high-grade peers.

