I didn't know I'd got an 'under-tray'. I do now.
It turns out that it was this 'under-tray' which made such a dreadful crunching noise as I came out of the flood down by the Mill turn. (No visions of Ursula Andress stalking sexily from the waves please - just a silver Audi emerging noisily from a large muddy puddle.)
As I drove on something scraunched on the road underneath me. Ooo err...not a good noise. It was a bit silly to go through the flood really - anything could have been in the water just waiting to knock cobs of my motor. I parked up at the Village Hall and tentatively knelt down (not wanting to get my knees wet) to see if I could spot the damage. And indeed I could. A large bit of rigid black plastic hanging down. B****r. Looks there will be no driving this home. More damned expense. Sigh.
On going through the water this 'under-tray', which in effect covers the car's undercarriage, had scooped up gallons of muddy water which being so heavy (we all know that a pint of water weighs a pound and a quarter don't we?) tore away the weedy plastic fixings which hold the tray in place and the whole caboodle collapsed.
The Glam Ass (bless 'im) came to the rescue and after a bit of grumbling and a bit of thought suggested I raise the height of the car. This particular model has the ability to raise itself at the push of a button to cope with different sorts of terrain. Clever huh? Why didn't I think of that?
It did the trick and I was able to proceed carefully back through the flood to our very best motor mechanic who has the necessary ramp and big screwdriver. It will be fixed sooner or later but for the time being I shall be driving the pick-up. This means no drive to Yorkshire on Friday for an aged aunt's funeral, but that is another story.
Please be warned - you too may have an 'under-tray' - do not mix with deep water.