I used Random.org to select the winner - I have copied the results for you below:
Step 6: Drawing Completed The winner of your drawing is...
Congratulations on the drawing! It was completed on Monday, 1 February 2010 at 00:03:01 UTC The winner was drawn from a list of 16 entrants using true randomness, which for many purposes is better than the pseudo-random number algorithms typically used in computer programs. You will find the permanent record of the drawing here:
Congratulations Sarah and thanks so much to all who entered. x