Much as I've enjoyed the other thread with the same title, I, for one, am still struggling with the puzzle. I see you all obviously are extremely busy but if, whilst changing gearboxes, gardening and cooking dinner you could spare a mo....
37a Shrub in deep valley beginning to spread, not good. D*R*E. I'm sure it's obvious but...
48d Vast area somewhat flat, undramatic. *U*S*A.