List of elected hereditary peers under the House of Lords Act 1999
Sitting

Hereditary peer
-
Party
First sat
Elected
Replacing
Margaret of Mar, 31st Countess of Mar
-
Crossbench
1975
1999
-
Rodney Elton, 2nd Baron Elton
-
Conservative
1973
1999
-
Michael Brougham, 5th Baron Brougham and Vaux
-
Conservative
1967
1999
-
Lucius Cary, 15th Viscount Falkland Elected as Liberal Democrat; joined Crossbenches in 2011
-
Crossbench
1984
1999
-
Anthony Hamilton-Smith, 3rd Baron Colwyn
-
Conservative
1966
1999
-
Euan Geddes, 3rd Baron Geddes
-
Conservative
1975
1999
-
Jan David Simon, 3rd Viscount Simon
-
Labour
1993
1999
-
Nicholas Lowther, 2nd Viscount Ullswater (left the house in 1999)
-
Conservative
1966
1 April 2003
George Makgill, 13th Viscount of Oxfuird
John Dawson Eccles, 2nd Viscount Eccles (left the house in 1999)
-
Conservative
1999
4 April 2005
Morys Bruce, 4th Baron Aberdare
David Pollock, 3rd Viscount Hanworth (left the house in 1999)
-
Labour
1996
22 March 2011
David Kenworthy, 11th Baron Strabolgi
Charles Colville, 5th Viscount Colville of Culross
-
Crossbench
2011
20 July 2011
Geoffrey Russell, 4th Baron Ampthill
Jamie Borwick, 5th Baron Borwick
-
Conservative
2013
17 July 2013
Hugh Mackay, 14th Lord Reay
Raymond Asquith, 3rd Earl of Oxford and Asquith
-
Liberal Democrats
2014
21 October 2014
Robert Methuen, 7th Baron Methuen
Alastair Campbell, 4th Baron Colgrain
-
Conservative
2017
27 March 2017
Charles Lyell, 3rd Baron Lyell
Aeneas Mackay, 15th Lord Reay
-
Conservative
2019
22 January 2019
Roger Bootle-Wilbraham, 7th Baron Skelmersdale

Question: Name a hereditary that continued to sit after The House of Lords Act 1999?
Answer: The House of Lords Act 1999 replaced some of the hereditary peers, Ampthill was one of the hereditary elected to continue to sit.