Questions 21 and 22 on the Census Test form both relate to ‘other’ usual addresses. Question 21 asks about motivation for living elsewhere during part of the week or year whilst Question 22 allows the identification of a precise geographical location together with information about duration of stay on a nights per week and weeks per year basis.
These type of questions would provide lots of interesting information about personal mobility (if not migration) and the duration of stay questions would tell us much about movement patterns of those second home owners, for example.
It is a shame that the Census Test in Scotland does not include any parallel questions about place of work since many people also have more than one of these, or about the duration of time that it takes to get to work since this information is increasingly important for transport planners.