Explain the differences between an uncodified and codified constitution.

The first difference between these two constitutional types is their source. A codified constitution is contained within one single document, whereas the source of a uncodified constitution is spread across statute, common law and constitutional convention. For example, the entire constitution of the United States, both the original text and its subsequent amendments, is contained entirely in a single document. This gives the constitution clarity and accessibility - all citizens and institutions can find and read the document easily. It is also arguable that having a codified constitution also raises awareness of the nation's constitutional arrangements, as they are often written after a significant historical event e.g. the American war of independence, or the end of colonisation. This means the citizens of a country may be more invested in the document than they would a scattered uncodified source.
On the flip side, a uncodified constitution is spread across statute, common law and constitutional convention. The best example of this is the United Kingdom's constitution. It is contained in statute, e.g. the European Communites Act 1972, in common law e.g. the doctrine of Parliamentary sovereignty and in convention e.g. the Sewel convention. This means that the constitution is not always clear and easily accessible. For example there have been many cases in courts where there is conflict between two different statutes that judges have to resolve. However, this arrangement does offer significant flexibility. For example, in the United States, which has a codified document, there is a lengthy process required to amend the constitution which includes gaining a two thirds majority in Congress. This process has often proved difficult to navigate; in the United States' entire history there have only been 27 amendments to the constitution. In stark contrast, in the UK, which has a uncodified constitution, the process to amend a 'constitutional statute' is almost exactly the same as amending normal legislation, the only difference is that a constitutional statute must be explicitly repealed within the new legislation. This difference means that a uncodified constitution is easier to amend and is therefore easier to keep updated with social and political developments.