OSM generally maps the street of its postal address. That is not necessarily the road that the door faces or its path leads to. Generally it's necessary to compare the allocated house number with those of adjacent dwellings. 

It's currently mapped as housenumber 2, 81 so probably there is a door labelled 2 (which is likely to be on St Donatt's Road) and a door labelled 81 (which is likely to be on Malpas Road).

Assuming that to be the case, the two doors would be mapped as nodes in the correct position on the perimeter of way 220407673 with the housenumbers and streets mapped on the correct node. The way itself should then not have either a housenumber or a street.