Ok, I heard back from the dealer who has heard back from Honda UK. Apparantly they don't recommend LPG (just like they dont recommend fitting your own sound system or blue interior lighting

)....
I guess the really bad news for me is that they wont warranty an affected systems. I guess the hard thing to figure out is exactly what is defined as an affected system? The entire engine? Transmission too? Only the fuel system? Rings, pistons?... I wish they would just put something official out cause my confidence in the dealer network is not incredibly high...
H