DP and I are mid 20s and moved into a new build apartment earlier this month, it was fully completed/open in June.
As a result the apartment post code can never be located and it’s all a bit of a mess! We couldn’t even pay council tax for the first few weeks 
There’s 2 postcodes - one for the apartment building and one for the road. Do you think it would be a problem if we started using the road postcode instead?
Also with an apartment block, is it necessary to put the street number too in the address? Oddly enough we have 2 street numbers too. I think it may be easier to just go by
“Apartment 1,
The Dakota,
Oxford Street” (fake names!)
Or do you think the number of the street is necessary?