Madagascar 3 The Video Game

Story related. London is the fourth city in the game and it comes after Paris Circus. After you have completed the City Events this baby will unlock.

If you get stuck at any point in the game, YouTube user WishingTikal has created a full walkthrough playlist of the game. I take no credit of the videos.

https://www.youtube.com/playlist?list=PLC6CD69588A1965F9