A long time ago now I heard Robin Cook saying a problem with our system is that it yo-yos on policy. Party A enforces a policy because it can, then on the next change of government tbey work flat out to dismantle A in favour of B. Nezt change of government B is phased out in favour of A. Or more likely some variation A*. The result is an utter mess. And, he said, he was sick of that idea of a strong government. A truly strong government is one where changes stay implemented, and by and large that is because they have been worked out by cross party agreement in some form. Strong majorities reduce the need for such agreements and in the long term can therefore end up achieving less of perminance.