The Douglas-fir can be found throughout Europe; including Belgium, Switzerland, Poland, Norway, The Netherlands, Hungary, Germany, Denmark, Czech and Slovak Republic.
According to records I could find in a quick Google search, there were plantings in 1908, 1935 and 1937. If you'd like the Longitude & Latitude, I'll be happy to furnish them. Here's a link to the International Tropical Timber Information System, so you can confirm it for yourself. http://www.ittis.org/profiles/profile_eu_be.htm
Just scroll down to the "Forest Resources" section.