i think...in fact im 99% sure ,if the car fails an mot it has been classed as unroadworthy and shoundn't be driven,as it does void the current mot

unless it failed on a few items which can also be re tested for free. the thing is this has always been the law but if you got stopped pre on line tests there was never any proof the car had been tested ,all you would need to do is supply the in date mot and all would be fine and dandy.

but now with the new on-line system if the car fails they log it on the computer, so the police know it failed and will pull you for it.

i work at a ministry of transport training center and the guy was chatting about this the other day.