02:45Sissinghurst: An Unfinished HistoryEpisode 1: ChildhoodBBC Radio 4 Extra Duration: 15 minutes Tue 21st Apr 2015, 02:45 on BBC Radio 4 ExtraAdam Nicolson's story of the popular British garden, started in 1932 by grandparents Vita Sackville-West and Harold Nicolson.GenresFactualFactualHomes & GardensSeriesSissinghurst: An Unfinished History Source: BBC Online