A couple of decades back I had a TR7. One evening driving back from work on the North Circular it was absolutely chucking it down. Came down from the flyover to see a "lake" in front of me. Had to decide; couldn't really go back against the traffic, couldn't really stop still and wait for ever. Kept it in low gear, foot slightly on the clutch to keep the revs high, and held my breath as I went through. Happy to say I did make it and didn't find any ingress when I looked later, even though I'm sure the water level outside was above the bottom of the door; but that was a bit stressful.