religious revival to bring about a resumption of widespread church building. Mechanised manufacturing, railways and public utilities required new forms of building, while the new industrial cities invested heavily in grand civic buildings and the huge expansion and diversification of educational, cultural and leisure activities likewise created new demands on architecture. The Gothic revival was a development which emerged in England and whose influence, except in church building, was largely restricted to the English-speaking world. It had begun on a small scale in the 18th century under the stimulus of Romanticism, a trend initiated by Horace Walpole's house Strawberry Hill. However, widespread Gothic construction began only in the 19th century, led by the renewal of church building but spreading to secular construction. Early Gothic revival architecture was whimsical and unsystematic, but in the Victorian era the revival developed an abstract rigour and became a movement driven by cultural, religious and social concerns which extended far beyond architecture, seeing the Gothic style and the medieval way of life as a route to the spiritual regeneration of society. The first great ideologue of this movement was Augustus Welby Northmore Pugin, who together with Charles Barry designed the new Houses of Parliament, the grandest work of Victorian Gothic architecture. The Parliament building's Perpendicular style reflects the predominance of the later forms of English Gothic in the early Victorian period, but this later gave way to a preference for plain Early English or French Gothic, and above all to a style derived from the architecture of medieval Italy and the Low Countries. This High Victorian Gothic was driven chiefly by the writings of John Ruskin, based on his observations of the buildings of Venice, while its archetypal practitioner was the church architect William Butterfield. It was characterised by heavy massing, sparse use of tracery or sculptural decoration and an emphasis on polychrome patterning created through the use of different colours of brick and stone. The Gothic revival also drove a widespread effort to restore deteriorating medieval churches, a practice which often went beyond restoration to involve extensive reconstruction. The most active exponent of this activity was also the most prolific designer of new Gothic buildings, George Gilbert Scott, whose work is exemplified by St Pancras Station. Other leading Victorian Gothic architects included G. E. Street, J. F. Pearson and G. F. Bodley. The Victorian period saw a revival of interest in English vernacular building