I see the London Low Emissions zone has been tightened up and older vans will now either have to be fitted with appropriate filters or pay a £100 per day fine for use in the zone.
Personally I think it's only a matter of time before this is applied to older cars too:
http://www.tfl.gov.uk/roadusers/lez/17700.aspx
Personally I think it's only a matter of time before this is applied to older cars too:
http://www.tfl.gov.uk/roadusers/lez/17700.aspx