The aim of the original HRA (2000) was the European Union wanting all of its member states to have something to work from, an original text from which the governments of member states could formulate their own human rights act/ bill of rights. However after the time it took for the HRA to be slowly and painfully explained to the judiciary (and wasn't that a worthwhile exercise boys and girls?
) the issue was droipped as it was deemed to ungainly for a government to introduce one bit of Human Rights legislation and then start working on its successor. The opposition and the press ewould have had a field day on that.
As it is, the HRA has been a useful scapegoat for poor legislation introduced by the government and the startling realisation that the judiciary aren't so much out of touch as ex directory. If there's a judicial problem, blame the HRA and most importantly blame Europe. If prisoners are being given televisions having earned them through working in the prison, dump it on the HRA and Europe. Cameron is actually, and this is the worrying bit, doing exactly what Labour claimed they were going to do just prior to the passing of the EU's Human Rights Act in the late nineties. He's accelerating through the Blair led New Labour Goverment history without having to deal with the issues that concern a government in office.
As for the original question. The constitutions of the states of America and Russia as well as a large amount of the Eastern European nations were formed in a period that has not been experience in Britain since Charles I suffered a very poor haircut. The post revolutionary era, in which a nation is experiencing a certain amount of patriotic feeling and most importantly, the feeling that what comes next must not mirror that which has gone before.
The English legal system is a gargantuan mass of complication, infuriation and bastardisation; having been allowed to get to this situation by centuries of an imperially focused government followed by the 20th century, in which the main aim of a government was to focus on gaining the majority of the vote for the next election. Governments don't especially care about sorting out the legal system because the general public do not care that we are still using the Offences Against The Person Act of 1861 with a few extra bits tacked on down the years. It won't win votes and so it's not brought up.
The mass of legislature and common law that makes up the English Legal System has not in any way been given the resources it needs to sort itself out in a clear and understandable manner. There is no effective scrutiny or even the equivalent to someone just chucking out the laws that have little relevance to modern society or reccomending those that need to be replaced.