Not necessarily a nightmare to sell as they're like rocking horse droppings in terms of rarity, but there's always someone out there looking for an auto defender.
Auto box and tuned TD5 works very well, especially with the electronic P38 / D2 box - the controller can be re-mapped to suit the engine and driver demands, which is easier than trying to change the brake bands, torque convertor etc on a non-electronic auto. Having said that, box rebuilds do seem to work well.
The only problem you will have is paying for it!
cheers
8)
Eeyore