Hi the search link below for NR20 5NF bring you to this area, as you can see by clicking the link.

https://www.openstreetmap.org/search?query=NR20%205NF#map=17/52.77059/0.99188&layers=N 

I don't know how you get it to go to Worthing, are you miss typing Worthing is NR20 5HR