Ive just shared the following comment with BA about the beta:
in either 14 or 17 i've never felt such a tangible effect of weather and the ball as in this innings. i'd simulated my batting so i started bowling in the last session of day 2 in cloudy weather. at the start of the innings for the first 10 overs edges were everywhere. we went off for rain and came back next morning in sun, immediately edges dropped by a significant amount. as the ball got older, edges really thinned out. with the second new ball, they increased a little but it was sunny and they were nothing like the previous evening when cloudy. cannot praise that highly enough.