§ Miss Joan Lestorasked the Secretary of State for Social Services what is the number of children living in families with incomes (a) below the supplementary level, (b) at the supplementary level, (c) 20 per cent. above and (d) 40 per cent. above the supplementary benefit level for 1974, 1975 and 1976; and how many of these children were in families whose head of household was in full-time work.