Hi Phill.
Sorry for the delay - only just seen your post.
Thank you for the great info.
I will look into some of the points that you have made. I think that the main issue is going to be the pressure (psi) of the gas here in the U.K. On an earlier search - I did find a company that make a booster for the use of natural gas - unfortunately though, they are not for the U.K. market.