Davie,
I used Formula Irvine before Wildact came along, always ran a bit hot. I use my current mix after speaking to the guy at ModelTechnics, seems to work just as well as Wildcat, a tad less smoke is all. Since noone in my area uses the Bekra mix I just get Jan at Swindon Models to get me in a box of 4galls at a time plus a some Klotz. Fanz are getting very rare, shame as they are great fun once you suss out a good set up. Mike