Hi Lars,
Turbofan was handled by Jim Fox a few years ago, and was taken over by Jet style UK until recently (last year) but it looks like their site is down now......(
http://www.tracyadam.karoo.net/ ) may be someone can tell us the real story?
Otherwise RS jets makes a short kit os a Mig15 and it looks like it is good value for the money!
http://www.ukjets.org/news.html
Regards
Florent