[Claudius]

... and here we are almost exactly four hours later at 3:25pm. It's draining off well, but is going to need a break from the rain during the coming week so that we can consider mowing it for next weekend.

Quite the difference in a few hours - it was running off quite quickly when I was there.

As an aside, was interesting to observe the flow of water near the "potholes" along the drive in; it quickly became clear that continued attempts to fill in these holes will be futile without also re-levelling the ground ahead of them.

See how there's a mound of dirt/grass in front of every puddle in Steve M's picture? When the water was streaming through at speed, the flow would hit those mounds, launch 10-20 cms high, and then drop... creating the erosion that causes these potholes. That is, it's not so much that the soil surface is being washed away, put rather that it is being pushed out.