 Some of Harrison 's designs , including his buildings at Lancaster Castle , were Gothic in style , but most were Neoclassical , particularly those at Chester Castle . He was regarded at the time , and since , as a major influence in the emergence of the Greek Revival in British architecture . A bridge he designed at the start of his career , and another towards the end of his career , incorporated innovative features ; Skerton Bridge was the first substantial bridge in England to have a flat roadway , and the Grosvenor Bridge was the longest single @-@ arched masonry bridge in the world at the time of its construction . Many of Harrison 's structures have survived , most of them now designated by English Heritage as listed buildings . Despite his work being nationally admired he spent his entire career in northwest England , visiting London only occasionally ; most of his buildings were in Lancashire , Cheshire , and the nearby counties . 
