Not hard, is it? The cover shows a collection of well-known London landmarks, most of them looking much the same now as they did when this book was published in 1968.
But it was nostalgia rather than a quest for information that led me to buy this on ebay recently. Although I had quite a large collection of I-Spy books as a child, I never had this one - probably because I didn't grow up in London :-( I was curious to find out what 'sights' it covered and whether they could all still be spotted now, almost 50 years later.