Well, George W Bush knows exactly who to ring.

BBC: Europe's stumbling foreign policy

The gold ring has an amethyst stone bearing a burning bush and St Andrew's cross with the motto "Nec Tamen Consumebatur".

BBC: Ring

So did both Hillary Clinton, America's secretary of state, and, surprisingly, George W. Bush, who stirred from his post-presidential obscurity to ring Mr Cameron and urge him to bring the UUP into line.

ECONOMIST: Policing Northern Ireland