In the 18th century a few English architects had emigrated to the colonies, but as the British Empire became firmly established in the 19th century many architects at the start of their careers made the decision to emigrate, several chose the United States but most went to Canada, Australia or New Zealand, as opportunities arose to meet the growing demand for buildings in these countries. Normally they adopted the style of architecture fashionable when they left England, though by the latter half of the century, improving transport and communications meant that even quite remote parts of the Empire had access to many publications, such as The Builder magazine. This enabled colonial architects to stay abreast of current fashion. Thus the influence of English architecture spread across the world. Several prominent 19th century architects produced designs that were executed by architects in the various colonies. For example, Sir George Gilbert Scott designed Bombay University & William Butterfield designed St Peter's Cathedral, Adelaide.