He suggested it could be based on a similar model to the Scottish parliament's current powers, underpinned by a separate legal jurisdiction for Wales.

BBC: Welsh assembly's 'new power after Scots independence'

Powers over criminal justice would include the courts prisons and probation, as well as the establishment of a separate Welsh legal jurisdiction.

BBC: Wales politics

Its constitution, the Basic Law, states that Hong Kong has a legal jurisdiction that is clearly separate from the rest of China's.

ECONOMIST: Chinese law

Contractors working directly for the Pentagon fall under a separate law, the Military Extraterritorial Jurisdiction Act, whereas those serving with American troops may be prosecuted under another law, known as the Uniform Code of Military Justice.

ECONOMIST: Iraq