Principles of constitution

Can legislate over anything 

Cannot be overturned 

Cannot bind successors

Democratic authority 

Iraq (2003)- large majority unpopular legislation 

Poll Tax (1989)

Central government has power over other tiers

Bogbanor- "Quasi Federal in practice"

Devolution- Scottish Parliament (1999)- British no interference in Scotland

A.V.Dicey- "Every person is subjected to the same law. If two people, one very rich and powerful and the other poor and unknown commit the same crime they should both be punished the same way". 

Monarch still retains formal powers

Examples:

Treaties

Troops in emergencies- Iraq (2003).