Under the uncodified British constitution, executive authority lies with the monarch, although this authority is exercised only by, or on the advice of, the prime minister and the cabinet.[5] The Cabinet members advise the monarch as members of the Privy Council. In most cases they also exercise power directly as leaders of the government departments, though some Cabinet positions are sinecures to a greater or lesser degree (for instance Chancellor of the Duchy of Lancaster or Lord Privy Seal).