Sounds like they are trying to pass on enforcement activities to MOT testers. Why? Because we pay for MOT tests and the authorities pay for Police. As said, the determined idiot will remove all the chavtastic "upgrades" from his Saxo before the test and carry on blinding people the day after.
It will probably end up like the new number plate regulations (requirement for BSAU and postcode). At the time I asked my MOT tester if he was seriously going to fail my car for not having these, despite having perfectly legal font and spacing, when he warned me about the new rules coming in. He just smiled. Sure enough, the rules got watered down.
What we desperately need, of course, is for all the cars with misspaced number plates, aftermarket HIDs that dazzle, lights that show blue light, excessively noisy exhausts, etc. hassled constantly by the Police. They'd soon stop bothering.
You only have to look at what happens in the US to realise what can be added to tests on vehicles supporting OBDII and later protocols. 5 gas emissions tests, checking for fault codes, checking that the vehicle has had time for all internal monitoring cycles to complete (so no clearing the codes straight before the test), checking of the Calibration Version Number to ensure the vehicle has the map it left the factory with. All possible with OBDII and later diag interfaces, and because these are standardised across the industry they just need to plug in and the the check is made.
No 3.2 would get through such an MOT.
Kevin