Retrofit: convert to Liquid Petroleum Gas (LPG)
If your vehicle has been converted to run on LPG you may meet the emissions standards. Converted vehicles will be treated based on the DVLA's records of its emissions standards. This means diesel vehicles should be converted to use LPG in a spark ignition engine, and the DVLA notified of the change.
We recommend using a UK LPG-approved installer. Our LoCITY programme has an up to date map showing LPG refuelling infrastructure in and around London.
The turd in question:

I'm guessing it'd be cheaper to buy a car already converted, would there be some kind of identifying document to confirm what the new emissions standards for the car are

Apologies for the barrage of stoopid questions
