The survey, which includes the views of the top 30 UK networks, comes in the wake of a host of annual results from dealership groups, many of which show profit margins on new car sales being cut.

NFDA director Alan Pulham said: 'For the last four years the survey has shown the perceived overall value of a new car franchise has progressively fallen. Over 60% of dealer networks continue to express the view that the range of vehicles they sold over the last 12 months has not enhanced the profit potential of their business.' Proton, Citroen, Toyota and Daihatsu dealers' networks have voiced most concern on new car profitability. However, despite those concerns, some franchises are showing 'positive signs' over their relationships with manufacturers.

BMW heads the ratings chart followed by Jaguar, Mercedes-Benz, Land Rover, Audi, Chrysler, Vauxhall, Saab, Hyundai, Skoda, Rover, Ford, Hondas and Renault with Lada and Proton propping up the 30-marque list.