Before 2010, the tallest building in London was One Canada Square in Canary Wharf. That’s the one that looks like a giant mirrored cigarette lighter. It’s 770 feet tall, which is now just “meh” by comparison.
The Shard in London - The Tallest Building in Britain - Go Guides
Before that, the highest point was St. Paul’s Cathedral at 365 feet. And before that? Probably a very tall tree. Or a mud hut with a big flag. The point is, London has always liked looking down on things.