It can be argued that good public policy should be difficult to impose; history provides us with the evidence that the separation of powers appears to be working even after two hundred years.
The U.K constitution in contrast to that of the U.S operates on the basis of a "fusion" of powers whereby the House of Commons holds the most power. This system could be seen to be undemocratic, yet does have the advantage of getting things done- passing legislation.
The fusion of powers could be seen in conjunction with the; First-Past-The-Post electoral system to contribute to what has been dubbed; Elective Dictatorship, whereby the party in power if it has achieved a large majority can pass laws unchallenged through Parliament. This would not be possible in the U.S because of the separation of powers.
Federalism could be seen to have an impact on the success of the separation of powers, as each state has many contrasting views and policies to the others , hence a separation is needed so as to protect the minorities.
In the U.K , or more so in a country the size of the U.K the views of British citizens could , collectively (excluding Northern Ireland) be seen to be pretty much the same. British politicians could be argued to be in the best position to decide on how to run the country. The previous statement may appear to be undemocratic , yet with the introduction of the bill of rights and the European Convention on Human Rights, minorities could be seen to be protected quite adequately , any abuse of power by the government can be challenged by Judicial Review as well as the E.U.
In some aspects , the U.S and the U.K "constitutions" are converging in the way that Parliament is no longer above the law and devolution in: Scotland and Wales could be argued to be leading the way to a possible federal U.K.
An important element of the separation of powers in the U.S is balance by having three equal , separate powers a state of equilibrium is achieved , neither power can influence or be corrupted by the other as can be seen in the U.
