The travelling community
Are absolutely loving this.
We have a local Facebook page highlighting these vehicles and the admin reports tens of untaxed or lapsed MOT vehicles to the police a week and they will do absolutely nothing.
They say it's a DVLA problem and they can't challenge the owners (if they could find them) however the vehicles must have a residency address for the V5 and insurance.
Seems they are terrified of travellers, However if you actually have a fixed address then watch out.