UPDATE.
Tried contacting the original installer,London Petroleum gas co.ltd, but it quickly became clear that they were no longer trading.Google shows that it was due to the fact he was a cowboy who destroyed a bloke Jaguar.The bloke got his teeth into him and after a year got him to court and was awarded damages for the ruination of his beloved car.The response was to close the company and carried on regardless in the name of his other company - Sovereign Classics,who
restore Jaguars and fit LPG systems.
http://www.lpginfo.co.uk/forum/viewtopic.php?f=3&t=319Google also shows that Sovereign classics have now stopped trading.Something to do with failing to file any accounts iirc.

I contacted the LPG register today and they were brilliant.They said he was a registered installer at the time my car was converted and if I posted the paperwork to them they should be able to add my car to the register,although it may take longer than usual due to Christmas holidays etc.
I emailed them a thankyou and attache the pic of the certificate he issued.They replied an hour later to say that they had added the car to the register.I cehcked,and sure enough its on there.
