You do say "Turn left down XYZ Road" but if you don't know or can't see which road you are on(happens quite often in the small bylanes in Central London), there

You do say "Turn left down XYZ Road" but if you don't know or can't see which road you are on(happens quite often in the small bylanes in Central London), there is always the very reliable, do you see "name of pub" in front of you - walk towards it. I was indicating the latter.