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FYI, regarding the MOT regs...
- any visible smoke at any RPM from a car which was originally fitted with a DPF is a fail.
- any signs of tampering (or removal) of the DPF is a fail.
So if you want to pass an MOT without needing a 'postal MOT', you need to have the DPF in place and it needs to work. Since it's been proven that you can reliably make good power with a DPF in place, there really is no reason to remove it...unless you intentionally want to clog up the planet with more soot. Not trying to be holier than thou or whatever; it just annoys me seeing cars which should run clean, but are billowing black smoke everywhere...it's not clever or cool!
As has also been stated in various places in this thread, it doesn't take a crazy long drive to keep the DPF happy; my 10mi/20min each way commute did it fine (M57 330d, no tune, decent fuel). You do need your thermostats to be working properly though, and other things like glow plug module errors can also prevent active regens.
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