31. Whether the living accommodation occupied by the household to which the return relates is—
(a)a whole house or bungalow (and whether detached, semi-detached or terraced (including end-terrace)); or
(b)a flat, maisonette or apartment (and whether in a purpose-built block of flats or tenement, part of a converted or shared house (including bedsits) or in a commercial building); or
(c)a caravan or any other mobile or temporary structure.