Baroness Serota, 49, a Baroness-in-waiting at the House of Lords who has been appointed a Minister of State at the Department of Health & Social Security, photographed at the Department's Offices, Alexandra Fleming House, London SE1 today. She succeeds the late Mr Stephen Swingler. Her salary now will be ?,635.00. Hitherto she has been a ?,000 a year Government Whip in the Lords. Lady Serato, whose maiden name was Beatrice Katz, is the wife of a civil engineer. She was created a life peeress in 1967.February 27th 1969