I was actually thinking about this recently and came to the same conclusion. Postcodes are normally for 1 street only, so the house number + postcode are the on

I was actually thinking about this recently and came to the same conclusion. Postcodes are normally for 1 street only, so the house number + postcode are the only things required. Normally when giving my address I give the road name too, just so online mapping services function properly. Typing "20 SE1 6AD" into google maps doesn't work.