13:00Radio 1 Breakfast with Greg JamesThursday: Grimmy sits in for GregBBC Radio 1 Duration: 3 hours Thu 22nd Mar 2012, 13:00 on BBC Radio 1 EnglandNick Grimshaw sits in for Greg James with some afternoon lols. Show more GenresMusicPop & ChartEntertainmentBrandRadio 1 Breakfast with Greg James Source: BBC Online