I've had problems with google address searches a couple of times, even in long established area's of London.
If you type an address straight into a google web search it will usually bring up a map result first, then other links (under the "All" results search tab, not just the "Maps" tab). Click on the map and your google maps app opens showing that location. Sometimes, typing the exact same address into a search directly into the google maps app brings up a different location.
Should say, that's with a "full address" lacking postcode. So house number, correct road name, local area/borough.
Off the top of my head I can remember this happening to me when trying to find addresses in Camden, Brixton and Twickenham. Can't remember which turned out to be more accurate, the general search or google maps.