Vauxhall has announced that it is to start publishing real-world CO2 and NOx emissions figures for its vehicles.

The unilateral move comes after widespread condemnation of the EU’s current testing regime, whose results often differ massively from reality on the road.

The recent Volkswagen scandal threw a sharp focus on the issue. The current EU test will be replaced in 2017 by the more up-to-date World Harmonised Light Vehicles Test Procedure (WLTP), which is much more closely aligned to everyday driving.

Vauxhall’s parent company Opel says it will start using the WLTP itself from next spring. And it will reveal the results, with the new Astra being the first car to come under the spotlight.

‘There is a tremendous focus on the automotive industry,’ said Opel boss Dr Karl-Thomas Neumann. ‘It is time to act.

‘In the USA, companies disclose their complete calibration philosophy to authorities. I would like to see us embrace this in Europe.’