What is needed is proportional representation, fixed term Parliaments, a written constitution and bill of rights which can be used to overrule both the executive and the legislature and probably a large dose of direct rather than representative democracy.
Gordon Brown has made a start, but only a timid one.
If there is to be true separation of powers it means a separate executive - and that means adopting some permutation of the washington system.
cam Freedom, Liberty, Equity and an Australian Republic