If you are a fan of the Harry Potter films, there are many places in London that you should be familiar with. A small list of places worth visiting in this case:
If you still happen to be a big, big fan of Potter, you can go to places related to him with a guide (two and a half hours of pleasure of recognition):
But if you want to get acquainted with Potter-related places already at home, watch this video: Julez about Potter
There is also a good video: HERE
If you want to see the Potter souvenir shop, look: HERE . Besides, you can see beautiful views from King's Cross station.