When I looked into this, I concluded...
There is no law specifying a DPF from new, so no law about removing them.
European emission standards define the acceptable limits for exhaust emissions of vehicles sold as NEW in EU member states, which most (but not every) manufacturer chooses to include DPF's in order to comly with.
Once the vehicle is in service, it does not necessarily (explicitly) have to comply with these regimes in the UK, but has to pass the MOT smoke test as defined in In-Service Exhaust Emission Standards for Road Vehicles manual, which differs for each vehicle variant.
Both diesel and gasoline cars both have MOT test procedures which differ from the methodology of the EU test.
With gasoline cars' MOT's, a crude emission test is carried out which specifies a typical HC limit of 200PPM, but the EU tests don't even specify a limit until EU5, and we can have 5x the CO in the MOT test than >EU3 standard.
Hybrid vehciles don't even have MOT emissions test, even though they may have a defective conventional engine.
www.motuk.co.uk/manual_730.htm
en.wikipedia.org/wiki/European_emission_standards
http://www.gov.uk/government/uploads...th_Edition.pdf
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