 While the whole exterior of the building, with its glowing sandstone, battlemented roofline and array of glinting leadlight windows give an imposing effect on top of the hill, it is the Great Hall that is regarded as the finest part of the design.The interior is loosely based on that of the Great Hall of Westminster, having a magnificent hammer-beam roof and a large mullioned and transommed window at each end.The windows of the long sides are placed high above an ornamented course in order that portraits may be hung beneath them, except at the south western corner where there is a large oriel window.