Seems to me there may not actually be a law against fitting and using adblue emulator / delete devices, or if there is I cannot find reference to it.
There are all sorts of emissions laws for the truck manufacturers to comply with but seems to be much less if any for the truck driver other than the MOT.
All I can find from research is information about "issue of repute " for O licence
To me it seems that this may or may not be against the terms of the O licence but does not actually seem to be against any actual law but is rather down to the interpretation of the DVSA
Have I missed a big chunk of legislation or is this a case of yet another quango twisting things around to suit their wishes without being an actual law ?