As I mentioned I know the qualifications for LPG are different, But as most gas fitters will know I can go to any gas training centre do a 4 day course to add LPG for residential, leisure accommodation vehicles, boats, catering units and so on and so on for a couple of hundred quid and straight out fitting LPG, with no LPG experience sad but true.
you say having a vent is not a good idea but surely a bulkhead fitting is not a vent as it'll be gas tight,
Is that not a good idea in your opinion or is it no it cant be done like that because it contravenes ....reg
regards