Warner Home Video, Microsoft, and MSN UK launched a new competition for UK residents earlier today to mark the release of the Harry Potter and the Order of the Phoenix DVD in the UK. The winner of the competition will be granted a walk-on part in Harry Potter and the Half-Blood Prince. To enter, click here and answer the question correctly. A different question will be displayed each week from now until December 20, which means you will have multiple chances to enter.

According to the rules:

The Winner will participate in the Walk On Prize as an extra in a crowd scene which may or may not be a silent scene. There is neither a guarantee that the Winner will be able to distinguish himself/herself in the film footage, nor that he/she will be featured in the final cut of the “Harry Potter and the Half-Blood Prince” film which is always subject to creative approvals and the Director’s final say. There is no guarantee that the Winner will meet or see Talent as part of the Walk On Prize.

You can read more about the prize and competition at this link.

Please note that the competition is only open to UK residents aged 12 or older.