6/6. Alan Titchmarsh surveys the last 100 years of royal gardening. Elizabeth -the future Queen Mother- restored the private garden at Castle of Mey in 1952. Similarly, Queen Elizabeth II has left her imprint on Windsor Castle, while Highgrove reflects Prince Charles's interests and concerns. Director Anna Gravelle ; Series producer Kath Moore (S) RT SHOP: Alan Titchmarsh 's accompanying book is £22.50. To order call [number removed] (national rate). Offer applies to UK mainland only