Groombridge or Harwoods in Lewes but whether they would be interested is another matter. Harwoods asked me to move my old Ninety off the forecourt! Thatched Garage 'Home of the the Man for Land Rovers' - I've not used them but heard they're ok. He does charge OTT for his old Land Rovers.
C R Allen in Peacehaven, local to me, good rep, virtually main dealer prices though.
John Bannon, Gumtree 4x4, Ditchling Common, very good know their stuff, used to rally.