This is a male Ctenophora cranefly, but the species is Ctenophora flaveolata, not C. ornata; C. ornata has a bigger dark patch near the wing tip, as shown here:
Both species are rare and listed in the Red Data Book, but they are seen fairly regularly in the New Forest and other ancient woodlands. For example, a female of C. flaveolata was observed on the iSpot website recently:
Still a great find though, and a spectacular insect to see and photograph. Would be worth sending the details to the Cranefly Recording Scheme:
I saw what I think is a Ctenophora ornata in a wood in the Netherlands this afternoon. After Martin's comments about flaveolata, I still think it is ornata, but could you confirm this?
If it is ornata, is a Red Data book species in NL, and is there anywhere I can report the record to?
The relatively large black patch on each wing means that this is indeed a splendid male Ctenophora ornata, they really are fantastic creatures. Not sure who would be best to contact in the Netherlands - several Dutch Dipterists are active on the Diptera.info site (http://www.diptera.info/news.php) so you could try asking there, or perhaps contact Dutch Butterfly Conservation and ask their advice (http://www.vlinderstichting.nl/english.php).
A key to the species of the subfamily can be found here: http://www.diptera.info/downloads.php?cat_id=21&download_id=117.