Find the following video title - Welcome to London - Look for the riddles to unusual places to visit in London - in the Puzzle Video Playlist
N 45 28.xxx, w 75 43.yyy
To calculate the final decimals for the North and West coordinates, fill in the blanks in the following sentences found in the video.
North - Founded by William the Conqueror in 1066, the complex has served variously as a royal residence, a notorious , a zoo, and the secure home of the Crown Jewels.
xxx = (#letters) X (digital root) + 479
West - Designed by Foster + Partners, the translucent shelters the historic Round Reading Room while creating a seamless, light-filled public plaza.
yyy = (#letters) X (digital root) + 449