U.K. time and German time were equivalent on the date in question, however is it clear whether the crash was at 0100 or 0130?
The claims which are closest are the ones in the BD sector, as La Boissière (I think the full place name is La Boissière-École) is about halfway between Rambouillet and Dreux. A full grid map can be found at:
http://www.lesbutler.ip3.co.uk/jg26/gradnetz.htm