The British trade is so important to a town where the average visitor spends £90 that a major effort has been mounted to explain how the end of the franc will affect cross-Channel travellers. The main task is to educate visitors about the new exchange rate of about 1.55 euros to the pound rather than the rule-of-thumb conversion of 10 francs to the pound. To that end, hundreds of thousands of leaflets have been printed that proclaim 'Au Revoir French Franc, Bonjour Euro' and 'New Euro Currency, Same Savings'. They have been produced by a consortium of the big Calais interests whose members include P&O Stena Line, the hypermarkets Auchan and Carrefour, Sainsbury's, Eurotunnel and, of course, those inexhaustible marketing professionals, the Chambre de Commerce et d'Industrie de Calais.