Dave Venables
I had removed the addr:housenumber from https://www.openstreetmap.org/way/67344924 

Based on the UPRN I suspect it is 1 Silverton Drive

https://www.openstreetmap.org/way/67344924  100030241157   number 1
https://www.openstreetmap.org/way/66497475 100030241158 100030241160 numbers 2 & 4

Had also moved the Zetland Cresent numbers along with 62 now https://www.openstreetmap.org/way/67344994

An on the ground survey may be helpful to provide certainty but code-point open postcodes, aerial images and Unique Property Reference numbers in combination are very useful
