Britain is unusual in that it has an 'unwritten' constitution: unlike the great majority of countries there is no single legal document which sets out in one place the fundamental laws outlining how the state works. Britain's lack of a 'written' constitution can be explained by its history.

Which are unwritten constitutions?

An Unwritten Constitution is the one in which no provisions or laws of the constitution are set in writing but they are documented despite not being incorporated in a single book.

Which nation has an unwritten constitution?

Israel,New Zealand,Saudi arabia,United Kingdom and Canada does have uncodified constitution also reffered as unwritten constitution. An “uncodified constitution” is a constitution made up of rules that are found from various documents in the absence of a single document or written constitution.