I went back to the Kennet the following evening after the 11lbs Barbel and fished a swim 50 yards downstream

10lbs 4oz Barbel caught on a sonubaits Tuff 1

The same baiting routine as the previous night and again waiting an hour before casting. This time it took about 15 minutes for the tip to pull round, not quite as big at 10lbs 4oz but still a double.