After a consultation document the DfT is considering removing the exemptions for roadworthiness testing from the following categories of vehicles: -
Some Engineering Plant & other Vehicles
Some Drying and Mixing Trailers for some road materials
Some Road Construction Wagons
Electrically Powered Vehicles
Medical and some other Health related vehicles
Some vehicles based on eight Scottish Islands
Tractors units towing exempt trailers
Operator licencing for volumetric concrete mixers and electrically powered vehicles.
In the next six months we will know what and when this will come into force.