Why would you need to know how tall the London Eye is?
In order to help pass the UK Citizenship Test. Would you pass?
According to the I newspaper, 2/3 of those already holding UK citizenship would fail!
For general interest, or if you are looking at nationalism in the ideologies section, a useful starting point for debate, perhaps.
Here are some (25) sample questions. Official pass mark is 75%, so we'll be generous and say you pass with a mark of 18.