I don't really understand Constitutional Conventions. Could you give an example?

In the UK, our Constitution (the rules that say how the country should be governed) isn't written in one specific document: it's made up of lots of different sources. A Constitutional Convention is just one of these sources. Basically, it's an informal practice that's been used over and over again, and so has become an important part of government - even though no person or document explicitly says that it should be done. So, if we use an analogy in normal society... Queuing is a British convention: no one actually says that we have to, but it's become such a common tradition that it's now part of the country's identity!One of the Conventions of the Constitution is the use of Royal Assent - that the Queen will always sign legislation proposed by Parliament, as it's final stage of becoming law. Technically, the Queen could actually refuse to give her Assent, override Parliament's sovereignty, and shut down the law! In practice, this hasn't happened since the 18th century (Queen Anne in 1708 - I'll go into this later if you'd like), meaning that taking a bill to the Queen doesn't really mean anything anymore - it's just a formal tradition. So again, simply because we've always done it the same way, Royal Assent has become a Convention in how the UK government operates.