From 3rd January 2012, emission standards for the London Low Emission Zone are tightening.
Your vehicle will still be compliant as long as;
Larger vans – registered as new on or after 01 Jan 2002
HGV’s & PSV’s registered as new on or after 01 Oct 2006
Horseboxes – will need to check depending on registration date.
To find out if your vehicle is compliant, you can check on the Transport For London website here: http://www.tfl.gov.uk/roadusers/lez/default.aspx