Gas is no more dangerous than diesel lol,if i lit a match right next to a gas leak and a match next to a diesel leak which would you choose,doh.
Oh dear.....

You've really got the wrong end of the stick havent you?
Is that what you based you 3k purchase on?
Dont you think its possiblre to control leaks of gas/diesel by any other method that lighting a match inside the vehicle?
What about fitting CO2 sensors?
What about fitting auto shut-off gas detectors?
What about acute/chorinc effects of gas or diesel on staff....have you considered them? How are you controlling them?
Judging by your posts, I think you've tried to off load your H&S onto the supplier of the equipment?....they said it was "safe" so it must be "safe"

Now lets try that with a set of ladders - you bought them but you fell offf them - who's at fault?...you or the manufacturer of the ladders?
Obviously its your fault. You didnt properly control the hazards.
How is gas/diesel different?
Please show me at least one link to at least one official site that shows my argument to be wrong?
Come on NWH, it cant be
THAT hard?....after all, you've spent 3k on the strengh of somebody telling you gas was "dangerous"

?
You MUST have researched this subject?