You could try Euro Motors in Garwood, N.J., near Cranford, Westfeild area.
Father & son, Father is an ex- Merc. Benz tech, but they are very familiar with the L. Rover marque, the father drives a Discovery II.
Always has a Rover there other than his, everytime I go there with mine.
Best part is, he does not rape your wallet.... ask for Vic the son.
I also want to mention that a mechanic there, also a retired Benz tech... older gentelmen, is a master transmission rebuider.