Only around 10 per cent of UK Volkswagens fitted with emissions-cheating software have been corrected, the company says.
The German car maker had earlier revealed that 1.2 million UK vehicles were affected by the software and has confirmed to the Press Association that 'over 110,000 vehicles in the UK' have been fixed.
Following the news, Louise Ellman, Labour MP and chairwoman of the Transport Select Committee, branded the lack of action 'simply unacceptable'.
She said: "One year on from the Volkswagen emissions scandal, nine out of 10 drivers are still waiting for their car to be recalled. Time and time again, VW's schedule has slipped.
"This is simply unacceptable when Paul Willis, VW UK's managing director, promised the transport committee that VW drivers could expect to have their cars fixed by the end of this year.
"People deserve to know when they can expect their vehicles to be corrected and returned to them. It's time VW came clean with its customers. If it refuses to do so, the government must act."
Volkswagen blamed the problem on the complicated process of having fixes approved for different models by regulators in different countries, and claimed it had written to more than 300,000 UK customers requesting them to have the recall work carried out.
"We are working hard to apply the approved technical measures to as many cars as swiftly as possible as soon as they are approved.
"The process of applying the technical measures has been under way since January 2016 and we have applied the measures to over 110,000 vehicles in the UK.
"We will continue to work closely with the authorities involved to fulfil our commitments."