Very long delays,what i noticed that the radio bulletins kept on saying about many flood warnings,which panicked the car drivers,as they seemed to leave a much longer safety gap between the cars in front of them,which the distance will increase in wet weather for braking distances,the radio news made them slow down,i drove down from Scotland,it was raining all the way down to the South West,but not that bad to cause the long queues.
A 4 car smash,which was on the hard shoulder near Birmingham,a flood in the hard shoulder in the area too,but 20 miles of congestion.