greg - It is an invariable rule in Canada, yes...and I think in the States as well.

I am shocked to hear that you mix your odds and evens in England! Appalled! I would have thought that a country with such a long and rich heritage of social organisation would have scrupulously avoided such dereliction of duty when it comes to street numbering systems. How does the post office in England handle this egregious situation?

- LH