16:00The Official Chart on Radio 1 with Jack Saunders20/03/2011BBC Radio 1 Duration: 3 hours Sun 20th Mar 2011, 16:00 on BBC Radio 1 N. IrelandReggie Yates counts down the latest official Top 40 to reveal the UK's new number 1 first with guests The Wanted, Parade and Dionne Bromfield.GenresMusicPop & ChartEntertainmentBrandThe Official Chart on Radio 1 with Jack Saunders Source: BBC Online