1979-2000: Margaret Thatcher (Conservative and Unionist)
1979 (Majority) def. James Callaghan (Labour), David Steel (Liberal)
1983 (Majority) def. Michael Foot (Labour), David Steel & Roy Jenkins (SDP-Liberal Alliance)
1988 (Majority) def. Roy Hattersley (Labour), David Steel & Robert Maclennan (Liberal Democrats)
1993 (Majority) def. Neil Kinnock (Labour), Paddy Ashdown (Liberal Democrats)
1998 (Majority) def. John Prescott (Labour), Paddy Ashdown (Liberal Democrats), Alex Salmond (SNP)
2000-2007: William Hague (Conservative and Unionist)
2003 (Minority with UUP confidence and supply) def. Tony Blair (Labour), Paddy Ashdown (Liberal Democrats), Alex Salmond (SNP), David Trimble (UUP)
2005 (Coalition with Liberal Democrats) def. Diane Abbott (Labour), Paddy Ashdown (Liberal Democrats), Alex Salmond (SNP), David Trimble (UUP)
2007-2015: Kenneth Clarke (Conservative and Unionist)
2010 (Coalition with Liberal Democrats) def. David Miliband (Labour), Paddy Ashdown (Liberal Democrats), Alex Salmond (SNP), Nigel Farage (UKIP)
2014 EU Referendum: 51.6% Remain, 49.4% Leave
2015-2017: David Miliband (Labour)
2015 (Majority) def. Kenneth Clarke (Conservative and Unionist), Alex Salmond (SNP), Charles Kennedy (Liberal Democrats), Nigel Farage (UKIP)
2017 (Majority) def. Philip Hammond (Conservative and Unionist), Alex Salmond (SNP), Vince Cable (Liberal Democrats), Nigel Farage (UKIP)
2017 EU Referendum: 54.2% Leave, 46.8% Remain
2017-0000: John McDonnell (Labour)
2018 Scottish Independence Referendum: 59.7% No, 41.3% Yes
*In November 1999, having led her party for almost 25 years, and her nation for over 20, Margaret Thatcher shockingly announces her resignation as leader of the Conservative Party. One month later, 39 year old William Hague becomes the youngest Tory leader in over a hundred years, and on the first day of the new millenium, he acceeds to the premiership. Thatcher immediately resigns from the Commons and is made Lady Thatcher of Kesteven. The Tories hold Finchley and Golders Green in the ensuing by-election.
*Despite a small gain in seats for the Labour Party, Diane Abbott loses her seat, necessitating her resignation as leader of the Labour Party. She is soon replaced by David Miliband, after an acting leadership lasting a few months courtesy of Deputy Leader Jack Straw.
*Having led his party to two hung parliaments, in mid 2007, the Prime Minister announces his coming resignation as leader of the Conservative Party. Kenneth Clarke, of the opposite wing of the Tory party to Hague, is elected his replacement and soon assumes the premiership.
*The Liberal Democrats lose half their seats in retaliation for them going into coalition with the Conservatives. Deputy Prime Minister Paddy Ashdown announces his resignation as leader of the Liberal Democrats, after 22 years leading the party. He is soon replaced by Charles Kennedy, who becomes Deputy Prime Minister on his ascension to the Liberal Democrat leadership .
*In the landslide defeat for the Conservatives, the Prime Minister lost his seat, as well as Deputy Prime Minister Charles Kennedy, with the Liberal Democrats going into single figures. Theresa May becomes acting Conservative Leader, while Vince Cable becomes acting Liberal Democrat leader. Philip Hammond is later elected Conservative Leader, and Vince Cable is elected Lib Dem leader in his own right.
*The second EU Referendum was held on the same day as the General Election. Although it results in an increased majority for Labour, the public votes to leave the EU 54 to 46. David Miliband announces his resignation as Leader of the Labour Party and his replacement, John McDonnell, is elected two months after.
I made a pretty ASB list of election results when I was in Year Ten with a divergence from 1983, with the Tories getting a landslide majority of over 250. I don't have the specifics of seat numbers on me right now unfortunately, but I do remember the leaders, their times in office, roughly where each party stands in parliament, and some big names who lost their seats after results. As for why Paddy lasts 22 years in the Lib Dem leadership, he does vastly, vastly better and eventually reaches about 120 seats, before crashing down to 60ish in 2010, mainly at the behest of Labour. Thoughts?