Given an increase in spare time, I thought I would investigate the register as it stands to enable analysis of those who might stand. The list as it stands follows and I will do further analysis as time allows.
Peer, rank (YoB, party if known, last by-election candidacy that received votes, 1st round votes for/total votes cast OR date of succession if no by-election)
Abergavenny, M. (1955, Con, 2018, 6/43)
Addison, V. (1945, Con, 2017, 2/346)
Ailsa, M. (1958, nk, nil, succ 2015)
Albemarle, E. (1965, XB, 2019, 1/28)
Aldenham, L. (1948, nk, nil, succ 1986)
Aldington, L. (1948, XB, 2019, 1/28)
Alexander of Tunis, E. (1935, Con, 2017, 3/346)
Ampthill, L. (1947, Con, 2013, 10/336)
Annaly, L. (1954, Con, nil, succ 1990)
Ashbourne, L. (1933, Ind, 2003, 1/423)
Ashcombe, L. (1964, Con, 2019, 15/259)
Aylesford, E. (1947, nk, nil, succ 2008)
Balfour, E. (1948, nk, nil, succ 2003)
Beaufort, D. (1952, nk, nil, succ 2017)
Bedford, D. (1962, nk, nil, succ 2003)
Belper, L. (1941, nk, nil, succ 1999)
Bicester, L. (1963, nk, nil, succ 2016)
Biddulph, L. (1959, Con, 2017, 2/346)
Birkett, L. (1982, nk, nil, succ 2015)
Bolton, L. (1954, Con, 2010, 1/45)
Boston, L. (1971, nk, nil, succ 2007)
Braybrooke, L. (1977, nk, nil, succ 2017)
Brentford, V. (1933, Con, 2004, 1/45)
Bridges, L. (1954, XB, 2018, 2/26)
Bristol, M. (1979, nk, nil, succ 1999)
Bruntisfield, L. (1949, nk, nil, succ 2007)
Buccleuch and Queensberry, D.(1954, nk, nil, succ 2007)
Burnham, L. (1968, nk, nil, succ 2005)
Cadman, L. (1938, Con, 2013, 1/336)
Cairns, E. (1939, XB, 2010, 1/26)
Calverley, L. (1946, XB, 2014, 1/283)
Camoys, L. (1940, nk, nil, succ 1976)
Camrose, V. (1970, nk, nil, succ 2016)
Carew, L. (1938, nk, nil, succ 1994)
Carlisle, E. (1949, LD, 2011, 12/316)
Carnarvon, E. (1956, Con, 2019, 20/259)
Cawley, L. (1946, nk, nil, succ 2001)
Chorley, L. (1966, nk, nil, succ 2016)
Clanwilliam, E. (Clanwilliam, L.) (1960, XB, 2015, 1/26)
Clifford of Chudleigh, L. (1948, XB, 2015, 1/26)
Clydesmuir, L. (1949, nk, nil, succ 1996)
Cobham, V. (1947, nk, nil, succ 2006)
Cochrane of Cults, L. (1957, nk, nil, succ 2017)
Combermere, V. (1969, nk, nil, succ 2000)
Cranbrook, E. (1933, Con, 2003, 5/426)
Cromer, E. (1946, XB, 2011, 1/416)
Dacre, B. (1983, nk, nil, succ 2014) - I believe she is the only woman on the list.
Darcy de Knayth, L. (1962, XB, 2008, 2/26)
Daresbury, L. (1953, nk, nil, succ 1996)
Darling, L. (1944, XB, 2017, 1/27)
Darnley, E. (Clifton, L.) (1968, nk, nil, succ 2017)
Daventry, V. (1960, nk, nil, succ 2000)
Davies, L. (1940, nk, nil, succ 1944)
De Clifford, L. (1966, nk, nil, succ 2018)
De La Warr, E. (1948, Con, 2018, 4/43)
De L’Isle, V. (1945, nk, nil, succ 1991)
De Ramsey, L. (1942, Con/XB?, 2019, 1/28)
Devonport, V. (1944, XB, 2008, 3/26)
Dormer, L. (1960, XB, 2019, 1/28)
Downshire, M. (Hillsborough, E.) (1959, nk, nil, succ 2003)
Drogheda, E. (Moore, L.) (1937, XB, 2011, 1/27)
Dudley, E. (1947, nk, nil, succ 2013)
Dudley, L. (1930, nk, nil, succ 1930)
Dundonald, E. (1961, nk, nil, succ 1986)
Durham, E. (1961, nk, nil, succ 2006)
Effingham, E. (1939, XB, 2019, 5/259)
Eglinton and Winton, E. (1966, nk, nil, succ 2018)
Eldon, E. (1962, XB, 2018, 5/29)
Elibank, L. (1964, nk, nil, succ 2017)
Ellenborough, L. (1955, nk, nil, succ 2013)
Enniskillen, E. (Grinstead, L.) (1942, nk, nil, succ 1989)
Erne, E. (Fermanagh, L.) (1971, nk, nil, succ 2015)
Ferrers, E. (1952, Con, 2015, 1/44)
Fisher, L. (1953, nk, nil, succ 2012)
Fortescue, E. (1951, nk, nil, succ 1993)
Gage, V. (Gage, L.) (1934, nk, nil, succ 1993)
Gainford, L. (1926, Ind, 2017, 2/346)
Gainsborough, E. (1950, nk, nil, succ 2009)
Glenconner, L. (1994, XB, 2019, 1/28)
Glendyne, L. (1960, nk, nil, succ 2008)
Gormanston, V. (Gormanston, L.) (1939, Con, 2010, 1/45)
Grafton, D. (1978, nk, nil, succ 2009)
Grantley, L. (1956, nk, nil, succ 2005)
Gray, L. (1964, Con, 2010, 1/45)
Grimston of Westbury, L. (1951, nk, nil, succ 2003)
Grimthorpe, L. (1954, nk, nil, succ 2003)
Hacking, L. (1938, XB, 2011, 52/316)
Haddington, E. (1985, nk, nil, succ 2016)
Halifax, E. (1944, Con, nil, succ 1980)
Hamilton and Brandon, D. (1978, XB, 2018, 2/29)
Hamilton of Dalzell, L. (1968, nk, nil, succ 2006)
Hampton, L. (1964, XB, 2019, 10/259)
Hankey, L. (1938, XB, 2019, 1/28)
Harlech, L. (1986, Lib Dem, 2017, 4/346)
Harrowby, E. (1951, Con, 2017, 15/346)
Hayter, L. (1943, nk, nil, succ 2003)
Hemphill, L. (1954, XB, 2017, 1/27)
Herbert, L. (1952, nk, nil, succ 2002)
Hereford, V. (1975, nk, nil, succ 2004)
Hill, V. (1945, nk, nil, succ 2003)
Hindlip, L. (1940, nk, nil, succ 1993)
Hives, L. (1971, nk, nil, succ 1997)
HolmPatrick, L. (1955, Lab, nil, succ 1991)
Hood, V. (1958, XB, 2018, 2/26)
Iddesleigh, E. (1957, nk, nil, succ 2004)
Iveagh, E. (1969, Con, 2007, 1/43)
Kenilworth, L. (1954, nk, nil, succ 1981)
Kennet, L. (1957, Lib Dem, 2017, 9/346)
Kilbracken, L. (1945, nk, nil, succ 2006)
Kilmarnock, L. (1941, nk, nil, succ 2009)
Kimberley, E. (1951, nk, nil, succ 2002)
Latymer, L. (1955, nk, nil, succ 2003)
Lauderdale, E. (1937, nk, nil, succ 2008)
Lawrence, L. (1937, XB, 2003, 1/426)
Layton, L. (1942, nk, nil, succ 2018)
Leathers, V. (1941, nk, nil, succ 1996)
Leicester, E. (1965, Con, 2019, 46/259)
Leven and Melville, E. (1984, nk, nil, succ 2012)
Lichfield, E. (1978, nk, nil, succ 2005)
Limerick, E. (Foxford, L.) (1963, Con, 2017, 5/346)
Lloyd George of Dwyfor, E. (1951, Lib Dem, 2017, 12/346)
Lonsdale, E. (1949, nk, nil, succ 2006)
Londesborough, L. (1959, nk, nil, succ 1968)
Lucan, E. (Bingham, L.) (1967, nk, nil, succ 2016)
Mackintosh of Halifax, V. (1958, nk. nil, succ 1980)
McNair, L. (1947, nk, nil, succ 1989)
Macpherson of Drumochter, L. (1979, Con, 2017, 4/346)
Margadale, L. (1958, Con, 2014, 14/283)
Margesson, V. (1960, nk, nil, succ 2014)
Marlborough, D. (1955, nk, nil, succ 2014)
Massereene and Ferrard, V. (Oriel, L.) (1940, XB, 2014, 6/283)
Melville, V. (1984, nk, nil, succ 2011)
Merthyr, L. (1977, nk, nil, succ 2015)
Meston, L. (1950, XB, 2019, 4/28)
Middleton, L. (1948, Con, 2015, 1/44)
Milford, L. (1961, XB, 2008, 1/26)
Milner of Leeds, L. (1951, nk, nil, succ 2003)
Milverton, L. (1930, nk, nil, succ 1978)
Minto, E. (1953, nk, nil, succ 2005)
Monckton of Brenchley, V. (1952, Con/UKIP?, nil, succ 2006)
Monk Bretton, L. (1924, nk, nil, succ 1933)
Monkswell, L. (1947, Lab, 2011, 21/416)
Monson, L. (1955, Con, 2013, 1/46)
Moran, L. (1952, nk, nil, succ 2014)
Morris, L. (1982, nk, nil, succ 2011)
Morris of Kenwood, L. (1968, nk, nil, succ 2004)
Morton, E. (1952, nk, nil, succ 2016)
Mostyn, L. (1984, XB, 2017, 4/27)
Mountgarret, V. (Mountgarret, L.) (1961, Con, 2019, 1/259)
Mowbray, Segrave and Stourton, L. (1953, nk, nil, succ 2006)
Napier and Ettrick, L. (1962, Con, 2019, 24/259)
Napier of Magdâla, L. (1940, XB, 2003, 1/426)
Nathan, L. (1957, nk, nil, succ 2007)
Nelson of Stafford, L. (1973, nk, nil, succ 2006)
Newall, L. (1930, Con, nil, succ 1963)
Noel-Buxton, L. (1975, nk, nil, succ 2013)
Normanton, E. (Somerton, L.) (1982, nk, nil, succ 2019)
Norrie, L. (1936, Con, 2005, 19/352)
Nunburnholme, L. (1973, nk, nil, succ 2000)
Ogmore, L. (1937, Lib Dem, 2011, 4/416)
Onslow, E. (1967, Con, 2013, 3/336)
Oranmore and Browne, L. (Mereworth, L.) (1929, XB, 2019, 1/259)
Oxfuird, V. (1969, nk, nil, succ 2003)
Parmoor, L. (1942, nk, nil, succ 2008)
Penrhyn, L. (1938, nk, nil, succ 2003)
Polwarth, L. (1947, XB, 2009, 1/27)
Poole, L. (1945, Con, 2005, 3/352)
Powerscourt, V. (Powerscourt, L.) (1963, XB, 2019, 4/259)
Rathcavan, L. (1939, Con, 2011, 1/45)
Renwick, L. (1935, nk, nil, succ 1973)
Richmond, Lennox and Gordon, D. (1955, nk, nil, succ 2017)
Robertson of Oakridge, L. (1975, nk, nil, succ 2009)
Rowallan, L. (1947, Con, 2013, 4/336)
Runciman of Doxford, V. (1934, XB, 2010, 2/26)
Russell, E. (1971, Lib Dem, nil, succ 2014)
Rutland, D. (1959, UKIP, 2005, 2/352)
St Davids, V. (1966, nk, nil, succ 2009)
St Levan, L. (1950, nk, nil, succ 2013)
Sandhurst, L. (1949, nk, nil, succ 2002)
Savile, L. (1947, nk, nil, succ 2008)
Scarbrough, E. (1973, nk, nil, succ 2004)
Seaford, L. (1946, nk, nil, succ 1999)
Sempill, L. (1949, XB, 2015, 3/25)
Shaftesbury, E. (1979, XB, 2011, 12/316)
Snowdon, E. (1961, XB, 2018, withdrew)
Somerleyton, L. (1971, XB, 2017, 1/346)
Southampton, L. (1955, nk, nil, succ 2015)
Spens, L. (1968, nk, nil, succ 2001)
Stansgate, V. (1951, Lab, nil, succ 2014)
Stockton, E. (1943, Con, 2019, 18/259)
Strange, L. (1953, nk, nil, succ 2005)
Strathcarron, L. (1949, Con, 2019, 32/259)
Sudeley, L. (1939, Con, 2014, 1/283)
Sutherland, D. (1940, nk, nil, succ 2000)
Swansea, L. (1957, Con, 2017, 4/346)
Swinton, E. (1939, nk, nil, succ 2006)
Temple of Stowe, E. (1955, nk, nil, succ 2013)
Terrington, L. (1946, XB, 2008, 1/26)
Teviot, L. (1934, nk, nil, succ 1968)
Teynham, L. (1928, Con, 2003, 1/426)
Tollemache, L. (1939, nk, nil, succ 1975)
Torrington, V. (1943, nk, nil, succ 1943)
Vernon, L. (1939, nk, nil, succ 2000)
Vivian, L. (1966, Con, 2013, 1/46)
Weir, V. (1933, Con, 2007, 1/43)
Wemyss and March, E. (1948, nk, nil, succ 2008)
Wharton, L. (1964, nk, nil, succ 2000)
Wigram, L. (1949, nk, nil, succ 2017)
Wilton, E. (Ebury, L.) (1934, nk, nil, 1957)
Windlesham, L. (1968, Con, 2019, 12/259)
Wise, L. (1949, nk, nil, succ 2012)
Woolton, E. (1958, nk, nil, succ 1969)
Wrenbury, L. (1966, nk, nil, succ 2014)
Wrottesley, L. (1968, nk, nil, succ 1977)
Wynford, L. (1950, nk, nil, succ 2002)
Yarborough, E. (1963, nk, nil, succ 1991)
Non-Royal Dukes and the Register of Hereditary Peers for election
Of the 24 Non-Royal Dukes, 4 are already in the House, 9 are on the Register. Whilst the two Irish Dukes are not eligible to stand in right of those titles, they do have subsidiary titles that enable them to stand.
Duke of Abercorn (I)
Duke of Argyll (S), (UK)
Duke of Atholl (S)
Duke of Beaufort (E) YES
Duke of Bedford (E) YES
Duke of Buccleuch & Queensberry (S) YES
Duke of Devonshire (E)
Duke of Fife (UK) NB - originally a quasi-Royal dukedom
Duke of Grafton (E) YES
Duke of Hamilton & Brandon (S & GB) YES
Duke of Leinster (I)
Duke of Manchester (GB)
Duke of Marlborough (E) YES
Duke of Montrose (S) IN THE HOUSE
Duke of Norfolk (E) IN THE HOUSE
Duke of Northumberland (GB)
Duke of Richmond, Lennox & Gordon (E, S, UK) YES
Duke of Roxburghe (S)
Duke of Rutland (E) YES
Duke of Somerset (E) IN THE HOUSE
Duke of St Albans (E)
Duke of Sutherland (UK) YES
Duke of Wellington (UK) IN THE HOUSE
Duke of Westminster (UK)