19:55Rugby UnionHarlequins v Castres OlympiqueBBC Radio 5 Sports Extra Duration: 2 hours, 5 minutes Fri 21st Jan 2022, 19:55 on BBC Radio 5 Sports ExtraLive commentary of Harlequins v Castres Olympique in the European Rugby Champions Cup.GenresSportRugby UnionSeriesRugby Union Source: BBC Online