text: Thousands of motorists have been fined or had their cars towed away after falling foul of new rules following the switch to digital tax discs. Many are buying used cars unaware that the old paper documents are now automatically cancelled when a vehicle changes hands. Ignorant that they must fork out for a new digital one – even if the existing paper disc is months from expiry – rising numbers of drivers are falling prey to clampers. Scroll down for video . Thousands of law-abiding motorists have had their cars clamped because they were unaware of major vehicle tax rule changes. File photo . Critics allege that the DVLA has been operating a 'money-making scam' after figures yesterday showed clamping soared after the paperless system was introduced in October last year. Many say the authority was too quick to penalise motorists without first warning that their car was not taxed. Drivers have faced bills of up to £800 to get their impounded vehicles back. The Government abolished the paper tax disc (pictured) last autumn . The DVLA was accused of 'heavy-handed and Draconian' behaviour yesterday after figures showed its use of clamping rocketed by 60 per cent from about 5,000 vehicles a month before the changes to 8,630 last month. With no right to appeal against the fines to an independent body, drivers have little choice but to pay up. The DVLA is estimated to be making millions of pounds a year because it receives double road tax payment – from both the seller and the buyer. Christopher and Marianna Webb, from Bridport, Dorset, were hit with an £822 bill to get their Ford Focus back after returning from holiday to find it had been impounded for non-payment of vehicle excise duty. The couple decided to swap their cars with each other and informed the DVLA of the change in ownership, without realising it meant the tax for both vehicles would be cancelled. Mr Webb, 56, told The Guardian: 'I feel they are very heavy-handed. Why did they not send a reminder letter?' Pete Hallam, whose car was also clamped, said: 'This is shady practice and reminiscent of the car parking wheel clampers a few years ago. It is a money-making scam.' Paul Watters of the AA said there had been only limited publicity from the DVLA about the changes to the vehicle tax system. 'There are a lot of people who are not aware of this – some may think they are covered because they see there is a tax disc on the windscreen,' he said. 'Clamping is quite heavy-handed and Draconian. Before they clamp they should try to get in touch with these people if they can.' A DVLA spokesman said: 'The changes have been widely publicised and we write to every vehicle keeper to remind them of the new rules before the vehicle tax expires. 'We also write to every new vehicle keeper when they buy a used vehicle to inform them that they must tax the vehicle before they use it. 'In addition, if a driver does not tax their car we will send a warning letter to remind them to tax as they are at risk of enforcement action.'
target: Driver and Vehicle Licensing Agency abolished paper tax disc last autumn .
  Car tax now automatically cancelled whenever vehicle changes ownership .
  Official figures show use of clamping soared from about 5,000 vehicles a month before the changes to well over 8,000 now .
  Critics say many targeted are innocent drivers unaware of rule change .