How would you reform and redraw UK local government?

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So let's say the Local Government Boundaries Commission has put you in charge of finally sorting out the muddle that is local government in the UK. Your task is to create a responsive and sensible local government structure and end the numerous failures in the system that has been introduced by decades of Westminster silliness. What do you do?

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I kind of think the London boroughs could be two-tier. Make four or five megaboroughs like NY has; then create parishes to represent individual districts currently amalgamated in artificial boroughs that are both too small and too large.