Thanks everyone for the helpful advice.
My conclusion is that from new the only "essentials" are the rubber mats load bay protection and seat covers.
At some stage I would also like full chequer plate (I know it's bling but I do currently have a Tomb raider,smile>) rear step / bumper, Roof bars, roof access ladder and light protectors all round. (the question is do I add then on now and risk the total outlay getting too high for the Financial Controller, or order them later and hope I can squeeze them past the FC? hmm)
I had not come across that auto conversion before but POA always scares me, also resale value will be hit hard I would have thought?.
One final question, looking underneath the TDVi at the dealers there is no underseal at all. I know that modern cars tend not to use underseal preferring wax injection and high-tech paints. But i suspect that with the Landie, under a few thou of indifferently applied paint is an expensive chassis waiting to rust, does nay one have any knowledge of the current state of Landie corrosion protection.