Although there is increased pressure on the vehicle owner to ensure that the vehicle is Taxed, MOT’d and Insured, it is also worth you as a garage knowing as well, especially if you have to take it out on the road.
The DVLA now offer a free to use checking service via the .gov website that allows you to enter a vehicles details and check that they are fully up to date with their paperwork.
You can check a vehicle by going to https://www.gov.uk/get-vehicle-information-from-dvla and entering the reg number and make.
This kind of service has always been available through the askmid site but now it is much more accessible.
Search for Motor Traders Insurance.