As I am no longer the owner of a Landrover Discovery these items are no longer required.
One set of Thule lockable Roof bars with keys for Discovery 3, 4 or Range Rover. £80.00. These are the ones that slot into the groove already in place on the roof of the Landrover and slide back and forth and then are locked into position.
Detachable Tow Ball with two keys. £100.00. This is the big chunkey thing that slots into the slot already built into the back of the landrover.
There is also a very robust dog guard for sale posted in the Dog section !
Due to weight and size collection preferred or may be able to meet within reasonable distance.