Z
The Nelsons, Jetts and Profis run fine on FAI fuel but need to be set up for it. I believe Performance sells them to the Europeans set up for Q500 over there. This year a Eurocup for Q500 was started and know the Brits are in it. I don't know what the British web site is but I know there is one. Following is the German site. Ask them questions in English and you will get answers in English including the correct contacts in England.
Denis
oops forgot the web site
http://www.rc-network.de/forum/forumdisplay.php?f=75