Just out of interest, what are the usual mainwheel tyre pressures on the A346? I only ask this because I recall from groundschool many years ago a way to work out an aquaplaning speed from tyre pressure - I think it's 8.7xsqrt P where P is the tyre pressure. I'm not sure of the input or output units for this formula, though. It may be of some interest, it may not.
Just a thought.
16B