The Only Quiz

What is the only city in Essex?
What is the only food that actually lasts forever and never spoils?
What is the only flying mammals?
Who is the only Great Britain female athlete to win three medals in a single Olymic Games?
What is the only major river to cross the equator twice?

What is the only metal that is liquid at room temperature?
Who is the only person to have been awarded two unshared Nobel Prizes?
Who is the only singer to have UK number one hits in the 50's, 60's, 70's, 80's and 90's?
What is the only country that ends with the letter 'h'?
Who is the only man to have won three best actor Oscars?
What is the only organ in the human body that can regenerate?
What are the only birds that can fly backwards?
Who is the only person Voldemort is afraid of?
In a deck of cards who is the only king without a moustache?
What is the only word that begins and ends with the letters 'und'?
Which is the only city to be located on two continents?
Which is the only country to have a national flag with a different design on each side?
Which is the only letter that doesn't appear in the Periodic Table?
Who is the only disney princess with a tattoo?
Which is the only country in the world named after a woman? (Hint: it's in the Caribbean)
Which is the only city in the world that has a National Park within it?
What is the only rock that floats?
What is the only poisonous snake in the UK?
Which station is the only one on the entire London Underground network with the word "London" in its name?
What is the only animal born with horns?