18:30CricketT20: Northamptonshire Steelbacks v Birmingham BearsBBC Radio 5 Sports Extra Duration: 4 hours, 15 minutes Tue 1st Aug 2017, 18:30 on BBC Radio 5 Sports ExtraLive ball-by-ball commentary from the T20 Blast on Northamptonshire Steelbacks v Birmingham Bears.GenresSportCricketSeriesCricket Source: BBC Online