Both Jeremy Dixon and Ed Jones resist any reminder that both of them, in different ways, went through a postmodern phase, Jeremy in his housing scheme at St. Mark’s Road and his 1986 building for Clifton Nurseries, and Ed in his project for Missisauga Town Hall in Canada.   But what could be more ostentatiously postmodern than their reference to the mausoleum of Halicarnassus, half ironic, half playful (and, in turn, to the tower of St. George’s, Bloomsbury) which greets the arriving visitor on arrival at Oxford railway station ?