I have been asked to reply on behalf of the Department for Transport.
At the time of implementing the national regulations to meet our obligations under directive 2007/46/EC a full impact assessment was undertaken and published by the Department for Transport. This is available at the following link:
The impact assessment includes a “Small firms’ impact test” and sets out the assessment undertaken at that time. The Department’s officials continue to liaise with the UK motor industry on the implementation of the directive.