Recently looking at a car for my niece, turned out to be a insurance cat classification as uneconomical to repair, and so could legitimately be back on the road.
Both licensing and insurance said they'd want to see it through genuine MOT procedures to ascertain that it's not a ringer, effectively.
So it seems to at least confirm the existence of numbers through third party view that may assist in completing documentation.
Also speaking to a local MOT centre that does work for dvsa, he confirmed the same.