I already said that about valuable items being individually listed.
The problem is that Mrs Nick has got a form from the specialist company that they are using (because it is an old, historic and listed building) and that makes the assumption that their library will contain books of equal historic value, that their furniture likewise etc. Just because it is a listed building it does not follow that the numpties who have designed the form have made allowance that the owners are "ordinary" people and not living in an ancestral hall along with the collections of furniture and books acquired by their ancestors down through the centuries.
Nick can see this but Mrs Nick is taking the questions on the forms at face value.