I have each of all mk.'s and models Mills engines. (except a 2.4, any one got one for sale!)
I also have copies by Aurora, Irvine, "Z" stamped Russian, Attachport,, CS, and simply the best, Doonside mk1 and 11.
(ah yes, I remember sending my $12.95 (?) to pre-order the mk1 in '72!)

Should I live in fear of being "busted" for flying "boot-leg" engines and having them all confiscated?