Wolf, these are not silly questions, as the construction materials affect the rebuilding costs of any property, and the type of locks affect the security aspects.
LV= never seem to be the cheapest, you should always get quotes from a comparison website.
Different prices from the same company, i.e. Admiral, depends on what level of cover you require. Are you just insuring the buildings, or including the contents? Is legal cover included? Accidental damage cover?