Do We Need Written Constitution?

In his article entitled, ‘The Sound of Silence: Constitutional Law Without a Constitution’ (1994) Law Quarterly Review, Sir Stephen Sedley notes , that it can be claimed:

"...in this country we have constitutional law without having a constitution, not because our constitution is unwritten but because our constitutional law, historically at least, is merely descriptive: it offers an account of how the country has come to be governed."