As of jan next year the mot will check for the dpf and fail if missing. Euro5 standard Came into force in2009 so perhaps pre 2009 cars will not be checked?!? Euro 5 does stipulate the presence of a dpf
I don't think that's right (but stand to be corrected). I've been looking it up and can't find anything that states a Euro 5 compliant car should have a DPF. In fact, I'd be very surprised if it did as the rules are output spec not input spec. In other words, they set the Particle limits (as well as Co etc) and then manufacturers have to meet those limits. It would be very odd for them to specify how manufacturers should do it as it would stop them investigating better ways.
Also, it came in on 1st September 2009 "for the approval of vehicles" and "shall apply from 1st January 2011 for the registration and sale of new types of cars". No mention of it being tested once the car is sold. This would not be part of the emmissions regulations but part of the MOT testing regulations.
New MOT testing regulations are still under discussions for 2012 so no decisions have been made. However, if they align with EC directive 2010/48/EU then for emissions tests a vehicle will fail if "Emission control equipment fitted by the manufacturer absent or obviously defective". However, in the introduction it says "‘Reasons for failure’ do not apply in cases where they refer to requirements which were not prescribed in the relevant vehicle approval legislation at the time of first registration, first entry into service or retrofitting requirements." So I'd say the relevant date, even if Euro5 does specify a DPF, would be 1st January 2011 i.e. cars registered after 01/01/11 would still need to keep the DPF (but as I say, not convinced even that is required).
So, I take it from that to mean that you can remove the DPF if there was no prescribed requirement for it to be there in the first place. In other words, unless the Euro5 emmissions regs say it has to be there then it's fine to take it off, as long as the car still meets the emmissions limits in the MOT. My guess is they have put that in now so that if EU6 requires a DPF then it has to stay on. They wouldn't normally retrospectively make you do something and this seems to back that up.
As I say, I could be wrong and happy to be corrected.
One thing I did find, which might be of interest to those whose DPFs have failed, is that the legislation says "vehicle manufacturers must also ensure that devices fitted to control pollution are able to last for a distance of 160 000 km."