Why aren't Liquid petroleum gas (LPG) cars available to purchase new in the UK?

Question

According to the direct.gov.uk website, ths is the case. See http://www.direct.gov.uk/en/Environmentandgreenerliving/Greenertravel/DG_064428

Answer 1

. There are very few LPG stations in the UK.  

But the site below says: "...There are already 115,000 LPG vehicles in the UK alone - nine million worldwide - almost any road vehicle can be converted to use Autogas.

Many LPG cars and vans even qualify for a 100% discount on the London Congestion Charge. " ...