When fraudulent, tax evading vehicles are "found" in road-side checks and other investigations - they are crushed.
You have to put these "crimes" on a scale of what society and the authorities consider the most serious.
Vehicle tax evasion and driving offences come quite low down on this list.
I you don't like this you can lobby your political representatives (we have elections coming up soon) and write to the authorities (DVLA & HMG Customs & Excise).
I gather
HMG Customs & Excise do have an reporting mechanism - how effective it is, I don't know.
What I do know is that the (fatal or serious) accident rate for Vehicles of Historic Interest are much lower than the general pool of vehicles on the road. And this is not just because they do fewer miles. The owners of VofHI tend to look after and cherish their vehicles (MoT'd or not).
It is for this very reason that government decided to drop the MoT requirement for VofHI and offer tax exemption.
There are fewer than 1 million VofHI (cars, tractors, bikes, buses, vans & lorries) and not all are on the road, compared to an overall vehicle population of, say, 40 million.
As Series 2 Land Rovers move under the classic car umbrella fewer are used as daily drivers and the costs move them out of the reach of younger impoverished drivers.
The cheaters need reporting, but it is not the role of this club to police, report or record these "crimes".
Apart from anything else we don't have the resources.