Ufo over Alkmaar?

A gorgeous cloudless day last summer, what ever it was must have passed right over the house, I caught sight of it when it was almost too small to see, I grabbed my camera and took a snap, I then tried one with the zoom full out but all I caught was a white blur because I was shaking so much, the "Thing" was noiseless as far as I could tell and was heading South West towards Schiphol, Amsterdam Airport at a slower pace than a jet would.
I have posted this picture on many forums most people find it intriguing but suggest it's a kite, or a satellite, well it's a bit low for a satellite and a bit metallic for a kite and on this wonderful warm day the wind was from a southerly direction so a kite would have been flying against the wind, what do you make of it?

This is the same photo as the one below enlarged
Taken 01/06/08 Alkmaar, Holland.

Click on image to enlarge


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