OSM has 3 Lansdowne Place mapped as https://www.openstreetmap.org/way/1105293433/ with a postcode of SE19 2UQ. Is that correct? The whole street has the same postcode and there's nothing OSM can do to change that. But a driver should be able to find it by the street address -- eg https://www.openstreetmap.org/search?query=3%20Lansdowne%20Place%20SE19%202UQ#map=19/51.41683/-0.08103&layers=N which you'll see resolves straight there. Only other suggestion I can make is that you've positioned the marker on the side of the building. If that's where the front door is, you should nevertheless put a number on the corner facing the road (I suggest making it a *big* 3,




