Or ask the people at the other flat if they can put a note on their door when you are expecting the engineer to install 
"Dear BT Engineer, You are at the wrong house"
lol..thanks... as its the flats i will have to put the note at the buzzer by the main door...
another funny option is to put a big welcome banner at the beginning of the road.. or even sitting at the bus stop by the road for the whole slot time waiting for a BT van...
Jokes apart I will try to check with Chris @ Pn whether he can pass this confusion to the engineer...
Edited by deleted (Wed 09-Jan-13 18:02:11)