19:55Rugby UnionChallenge Cup Final: Cardiff Blues v GloucesterBBC Radio 5 Sports Extra Duration: 2 hours, 35 minutes Fri 11th May 2018, 19:55 on BBC Radio 5 Sports ExtraLive rugby union commentary of Cardiff Blues v Gloucester from the final of the Challenge Cup in Bilboa, Spain.GenresSportRugby UnionSeriesRugby Union Source: BBC Online