john sobel bbc news, havana. >>> the economy stupid. do you remember that campaign slogan?s bill clinton's when he fought the 1992 presidential election. and traditionally, that one issue stands above all the others when it comes to a major vote. well the same can be said for the uk and in next month's general election. but the impact that immigration is having on both the economy and society has been riding rapidly up the list of key issues this time around. a recent poll shows that the immigration question bothers more people than anything else after economy and health. especially in areas where the economy is in thex doldrums. our correspondent ben brown, is in the british, well, seaside town of grimesly here ben. it's fair to call it a one-time great fishing port, because it's been a long and slow decline hasn't it? >> yeah we're in the port here, david. it has been a decline in terms of the fishing vessels that used to go out and catch fish. although actually, that industry has been replaced somewhat by a lot of offshore wind farms and also food processing. having said