having just had a problem with my D2 i would advise changing the leads asap, however due to the way LR made them the coil packs are under the inlet manifold,ifound this out due to the car juddering,the leads were failing and the engine mangement system compensated,this burnt out the coil packs, to change them the garage had to remove the manifold, the leads have clips on them at the coil end, how thiey work i dont know, but i know the coils leads and plugs cost me nearly £600 to get done, so change the plugs too if you can get to the leads to change them