Car tax discs end in six weeks, but motorists could be losing a good investment if they scrap their old discs with the rarest editions worth up to £1,000 to collectors.
Paper tax discs will be worthless from October 2015 but for a few British drivers they could be an unexpected money spinner.
The rarest paper discs can be traded for hundreds of pounds each by enthusiastic collectors, sometimes known as "velologists".
The priciest disc recorded is from December 1921 (picture, left, from britishtaxdiscs.co.uk) and sold for £810.30. According one collector, a pristine example of the disc could sell for up to £1,000.
But after 93 years of adorning windscreens, on October 1 2014 discs will start to be replaced by electronic records that will use police cameras to check number plates and catch owners who have not paid.
Discs issued before then will remain valid until they expire, and motorists do not need to act until their disc is due for renewal. For more details see telegraph.co.uk/money.
However, motorists shouldn't rip up their old disc when the new system is introduced. Modern discs are set to increase in value, collectors predicted, with new emergency-issue non‑perforated disks likely to fetch the most.
'Keep those discs about to expire'
Tony Hill, who has a disc for every year since they were first issued in 1921, said that in 10 years' time the discs would have increased in value but that thanks to the scale of production most discs would not be worth more than a few pounds.
Mr Hill, author of Trade and Collect Tax Discs, advised motorists to hold on to their old disks and keep them pristine. "As a dealer I am really looking for the perfect disc," he said.
"Keep those discs that are about to expire in good condition they could be worth a few quid."
Some will be worth more than that, however. As the Driver & Vehicle Licensing Agency (DVLA) is running low on perforated tax disc paper, it has begun to print a stopgap supply of tax discs on normal paper.
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Tax discs issued between now and when the discs are abolished in October will be printed without perforations, so motorists will have to cut them out themselves. This limited stock of emergency discs is tipped by collectors to accrue the most value.
Motorists already sell old discs through auction websites. Two vintage discs from a black cab in 1955 were listed on eBay for £55. The disc cost the original motorist £3 and eight shillings.
'Unusual' discs the highest value
Stephen Challis of britishtaxdiscs.co.uk predicted that the new electronic system would increase the desirability of these older discs.
"All the talk about tax discs ending has generated even more interest, which is great," he said. "People are saying that all of a sudden they've got a vacancy in their windscreen and want to fill the spare space with a rare disc."
Mr Challis said the biggest money spinners were discs with a typographical error or those issued for a rare vehicle. "What gets people most excited is a speciality disc," he said.
There are several unusual discs that demand the highest prices, Mr Challis said. One example is the emergency disc issued during the 1971 postal strike. These rare finds were issued by local taxation authorities as temporary licences.
In 1954 the Government reprinted tax discs using new artwork but printed "1953" on them by mistake. Instead of recalling them, it printed a black rectangle over the "3".
More recently, the DVLA automatically sent out discs dated "30 March" as opposed to the end of the month on the 31st. "Even (Taiwan OTC: 6436.TWO - news) modern day ones like this become very interesting for people," Mr Challis said.