Research carried out by Grant Thornton’s agribusiness group showed that 84 per cent of the 70 importer, grower and food-manufacturing supply companies surveyed want clear standards set for the measurement of food miles, while 79 per cent would like a clear set standard for carbon-dioxide emissions.

More than a third already give an account of their environmental performance when tendering for supply contracts with the UK’s eight largest retailers and almost half have been approached by the major multiples to discuss ways of making their trading more environment friendly. Ian Carr at Grant Thornton said: “The lack of clear standards and the sheer complexity of certain aspects of measurement is adding to confusion and making real progress slow. Government leadership on standardisation is essential.”