16:00The Official Chart on Radio 1 with Jack SaundersDev sits in for GregBBC Radio 1 Duration: 1 hour, 45 minutes Fri 4th Sep 2015, 16:00 on BBC Radio 1 EnglandDev sits in for Greg James with the UK's new Top 40 - find out where Justin Bieber, Demi Levato and 5SOS land!GenresMusicPop & ChartBrandThe Official Chart on Radio 1 with Jack Saunders Source: BBC Online