[The road isn’t very obvious on the satellite image, but it is there, and there are around 8-10 houses on it.]
However, all the houses on it have names, not numbers. For example, the final one is called “Hazelbury”. (Official address: Hazelbury, Station Road, Grove, OX12 7PF). I can’t find a way to add this as a house number, so how to I add houses to this road to indicate that it is a real road that people live on?
I believe in the number field you can only enter whole numbers (integers), ie only using 0 to 9, so no 3a or house names etc.
I believe the only way to add house names is via a place point, however I would suggest that unless you know for sure which house is which then I wouldn’t bother because the postcode points to the road you just added so people should be able to find it OK.
I would mark the road as private and remove the street name because IMHO Station Road is the main road not this little private drive.
There will be some senior editors along soon who might be able to give you better guidance.