UK: The balance of competences between the UK and EU - the single market, free movement of services and company law

As part of its review of the balance of competences between the UK and European Union, the Government has published a call for evidence in the area of the single market and free movement of services: see here (pdf). Included is a question on company law: what is the effect of EU level company law legislation and the desirability or otherwise of further harmonisation?