16:00The Official Chart on Radio 1 with Jack SaundersGreg James sits in for ReggieBBC Radio 1 Duration: 3 hours Sun 12th Dec 2010, 16:00 on BBC Radio 1 N. IrelandGreg James sits in for Reggie Yates to count down the latest official UK Top 40, plus the latest news and gossip from those behind the chart headlines.GenresMusicPop & ChartEntertainmentBrandThe Official Chart on Radio 1 with Jack Saunders Source: BBC Online