Example of ordinarily-enacted statute which made fundamental changes to UK constitution
Bill of Rights
Parliament Acts
HRA
Judicial interpretation of statutes may add to constitution
Factortame
Common law has established and developed key principles of the UK constitution
Article 6 HRA
It is practically nearly impossible to repeal statutes without upheaval
Human Rights Act
European Communities Act
Process of changing constitution by enacting new statutes is long
Human rights act
HOL reform