14:455 Live Sport5 Live RugbyHarlequins v NorthamptonBBC Radio 5 Live Duration: 2 hours, 15 minutes Sat 12th May 2012, 14:45 on BBC Radio 5 LiveLive rugby union commentary of Harlequins v Northampton in the first Aviva Premiership semi-final play-off.GenresSportRugby UnionBrand5 Live SportSeries5 Live Sport: 5 Live Rugby Source: BBC Online