Potter prop stolen.

But it couldn't have been easy. 

From the Guardian:

Detectives suspect a cherry picker may have been craned over fencing to hoist out the turquoise 1962 Ford Anglia, which featured in Harry Potter and the Sorcerer's Apprentice, when it took to the air after JK Rowling's characters pressed a silver button on its dashboard.

Oh, and PS, Martin Wainwright, the movie was called Harry Potter and the Sorcerer's Stone (or Philosopher's Stone, depending on the country).  But the car itself was in Chamber of Secrets.  Sheesh.  Get it right.