I had a cunning plan to extract contours from an Anquet DVD for transfer to Google SketchUp and from there to experiment with shadows. However, Anquet DVDs would seem to be quite different from the old Ordinance Survey CDs. It is not possible to isolate the contours.
Be warned because they retail at £70!!
I was lucky in acquiring mine for pennies after eBay sent me a timely voucher which covered most of the cost.