National Insurance Act 1946. First interim report by the government actuary for the period 5th July, 1948 to 31st March, 1950. Treasury chambers, 2nd February, 1951, Douglas Jay. Presented pursuant to act 9 & 10 Geo. 6, c.67, s.39 (1) (b) and 39 (2) (His Majesty's Stationery Office, 1951)