 Many of the changes under Victoria were to the surrounding parklands and buildings . The Royal Dairy at Frogmore was rebuilt in a <unk> style in 1853 ; George III 's Dairy rebuilt in a Renaissance style in 1859 ; the Georgian Flemish Farm rebuilt , and the Norfolk Farm renovated . The Long Walk was planted with fresh trees to replace the diseased stock . The Windsor Castle and Town Approaches Act , passed by Parliament in 1848 , permitted the closing and re @-@ routing of the old roads which previously ran through the park from Windsor to Datchet and Old Windsor . These changes allowed the Royal Family to undertake the enclosure of a large area of parkland to form the private " Home Park " with no public roads passing through it . The Queen granted additional rights for public access to the remainder of the park as part of this arrangement . 
