In the UK there are none on the G- register, however there is a N registered Navion B based at Earls Colne in Essex and the owner is importing another from the USA. There is also an N reg Navion Rangemaster based in Guernsey. In Germany there are 7 there are two each in in France and Sweden.
If you send me a PM I can let you have details of the owner at Earls Colne
Happy New Year to all on PPrune
G-APDK