I am not on the net every day, because my answers late :)! You can find this NIKON when you go from Tower Bridge to Design Museum,not Thames wharf than next street parallel to Thames warf. Go through one of passage on the right side and you will see squar place among buildings. You will see fountain made like pool, and that is all. On A-Z visitors guide pocket edition, NO 87. Good luck! If you don't find I can show you when I came again :).