Should we move towards a US Style Constitution?

Interesting discussion on the British Constitution with David Starkey arising from the Damien Green affair:

http://news.bbc.co.uk/1/hi/programmes/this_week/7766700.stm

Much of the criticism could equally be applied to the Dáil (if not more so, with even less oversight in the Senate), and Starkey suggests moving from the traditional British model towards a more American style system, primarily to strengthen the legislature. A disjoint between the Executive and Legislature might make for a difficult adjustment for those used to Parliamentary systems, but I tend to agree on the need for separation fo powers.