Registered DVLA companies sell registration plates to drivers without carrying out proper checks, has established a BBC investigation.
In some cases, this has resulted in registered owners being confronted with penalties or being arrested when it is wrong to prevent their vehicles from being involved in a crime.
A company in Birmingham made cloned plates in 10 minutes without checking the log.
Another shop for number plates said that the company, when faced, did not "intentionally fail to meet its obligations".
A vehicle user must be asked to prove his name and address and his right to use the registration number when he asks for a new license plate.
Failure to perform these checks may result in companies producing records with license numbers that buyers are not allowed to use, giving them the freedom to drive a vehicle that bears the identity of someone else's car.
Neither the DVLA nor the police could give a precise figure for the number of cloned cars on the road, but told the BBC that this was a major problem.
Adam Shirley, of Camberley in Surrey, has received 18 letters claiming a total of more than £ 1,000 in fines after vehicles with his driver's license have collected parking tickets in places where he has not been. Most came from London's Wandsworth district, 30 miles away.
"I'm a little worried that someone will commit a bigger crime by using a car with my license plate on it," he said.
What rules are there?
- You can only get a registration number that has been made by a registered supplier
- The supplier must see original documents that prove your name and address
- The dealer must also see original documents indicating that you may use the registration number
- Details of registered suppliers and the documents that you can use are available on the government website
Two Birmingham retailers both asked to demand a log, despite being a DVLA requirement for all registered retailers, when an undercover reporter from the BBC asked for license plates.
One, Numberplatesrus, delivered three cloned plates and could produce a set in just 10 minutes.
One employee claimed software with DVLA & # 39; to have that & # 39; against payment & # 39; with your name and reg enzo.
The DVLA said that such a system did not exist.
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At another store in Handsworth, C & C Car Spares and Accessories, no one demanded a vehicle log and staff made a copy of Mr Shirley's already cloned plates and also delivered plates from a BBC-registered vehicle.
In a letter, C & C Car Spares and accessories accepted there had "a number of shortcomings" after secretly filing sales signs without the required checks, but said it felt "deliberately and deliberately duped".
The owner said he would remain "vigilant to ensure that he would not be placed in this position in the future".
A DVLA spokesperson advised motorists who believed that their plates had been cloned to contact the police and said it was performing random checks to ensure that suppliers producing license plates do the same correctly.
You can watch this story completely on BBC Inside Out in the South, South West, East and West Midlands region at 7:30 PM BST on BBC One on Monday September 10, or via iPlayer for 30 days afterwards.