18. In respect of any person aged 16 years or over but under 75 years on census day, who was not doing any work at any time during the week preceding census day whether—
(a)he was actively looking for any kind of paid work during the 4 weeks preceding census day;
(b)if a job had been available during the week preceding census day he could have started it within 2 weeks;
(c)during the week preceding census day he was waiting to start a job already obtained;
(d)during the week preceding census day he was retired, a student, looking after home or family, permanently sick or disabled or none of these; and
(e)he has ever worked and, if so, the year he last worked.