text: All the data in OSM looks OK, this retrieves all roads named Seafield Close in Sussex and even puts the right postcode on your road: https://nominatim.openstreetmap.org/search.php?q=seafield+close%2C+sussex&polygon_geojson=1&viewbox=
  
  I presume you may be using another source for search which may match Ruskington & Rustington (only one letter different) & then finds Field Close as closest match. This would suggest that the other source does not have Seafield Close in its data & this is the nearest fit. Search engines which behave like this include Facebook and several others. Sorry to have got mixed up first time round.