Brown's admission of failure
When prime ministers realise they're failing at every major policy objective they set themselves, they hunger for just one small success. With John Major it was motorway cones. Brown, having failed in health, in education, in immigration, in welfare reform, in constitutional probity, in foreign affairs, in defence, in Europe and in crime is now in a state of desperation to find just one, tiny, easy policy area in which he can succeed. He's chosen plastic bags.
Ten years on the sidelines and we finally know what Brown's Big Vision is; it is the people of Britain carrying little string shopping bags around.