@ Andy L
What the proposal says:
L-category vehicles shall be equipped with designated measures to prevent tampering of a vehicle's powertrain, to be laid down in a delegated act by means of a series of technical requirements and specifications with the aim:
(a) to prevent modifications that may prejudice safety, in particular by increasing vehicle performance through tampering with the powertrain in order to increase the maximum torque and/ or power and/or maximum designed vehicle speed as declared by the manufacturer of a vehicle upon type-approval, and/or
(b) to prevent damage to the environment.
However yes the problem is the delegated acts, you say "they are to be subsequently defined by the Commission as they see fit. " however there are amemends by MEPs to the proposal so that the EU Parliament has scrutiny on what the EU Commission is doing.
But still a problem as the whole process would need constant monitoring so that they dont slip anything in.
However the DfT have a consultation at http://www.dft.gov.uk/consultations/dft-2011-26 and read this
You can ride in demos and sign petitions and demand that we should leave the EU - all good stuff.
But the proposals are here right now and being discussed and there is an oportunity to respond.