I had my windscreen replaced a fortnight ago and the guy blacked out the aperture for the vin no, more secure now. Read the article linked below....
http://www.autoexpress.co.uk/news/autoexpressnews/203880/hide_vin_plea_to_beat_crooks.html
http://www.autoexpress.co.uk/news/autoexpressnews/203880/hide_vin_plea_to_beat_crooks.html