It doesn't deal very well with house numbers. "10 Downing Street, London" does not produce a useful result. It doesn't find the two nearest chinese places, but does find the nearest chippy. It has a strange idea of where Elephant and Castle is (Bronti Close apparently), and doesn't know about the London Congestion Charge.
It has icons for tube and mainline stations in London, but not in Leicester (though it does show tracks everywhere).