THE Prince of Wales visits Bologna this month to open an exhibition inspired by his Vision of Britain book, television programme and exhibition held at the Victoria and Albert Museum. But in 'A Vision of Europe' the Prince demonstrates that the Classical architecture he advocates is not merely a parochial British concern. The list of exhibitors includes some of his favourite architects. The Prince's attack on the British architectural establishment in A Vision of Britain has made the exhibition's advisers nervous about releasing the text of his forward to the Bologna catalogue. Brian Hanson, director of the Prince of Wales's Institute of Architecture, says the exhibition is 'intended to be a very positive showing of schemes being built across Europe'. 'A Vision of Europe' opens in the church of San Giorgio, Poggiale, Bologna on 29 September.