Well, thanks to Terry at GEE who found me a used top leaf and definitely gets the very helpful prize. Fitted this afternoon. I think I will have to sort out a good pair of springs though in the longer term. I'll be a bit more cautious over the potholes until then, wasn't worried about the sump as it's a Dunnell modified one on my zetec and well out of the way.
May get round to the photos soon.