Mark - sorry to hear of your recent bad experience of Profess. I have been contemplating where to get mine converted and my choices were Profess, Leeds LPG and Battersea Autogas. I am really tempted now to go to Battersea Autogas but got confused when they said when I enquired recently that they would use a Levato system and that I must have the flashlube fitted.
I then registered with the LPG Forum and there seemed to be a difference of opinion with the flashlube.
You have had a few cars converted over the years, in your view should i insist on a BRC system and forget the flashlube.
I had the BRC system & it was fine, they insisted on fitting the flash lube & done it for free in the end, when it ran out I never refilled it. I found the customer service superb & they were very informative & enthusiastic. Systems have advanced over the years. Go and speak with them I am sure they will advise you on the best system for your car. I will be taking my toyota powervan to them. My better half is working directly opposite them at the moment & says they have bentlys & alike in there for conversion. My Lexus might end up in there if I don't get a satisfactory result at the weekend. As I will contact my card company to reverse the transaction if things go bad on Saturday.