Tory Prime Minister David Cameron, Labour's Harriet Harman, Lib Dem leader Tim Farron and Green Party leader Natalie Bennet have shared a platform to make the case to Remain in the European Union.
But it's not the first example of cross-party harmony in either the EU referendum or recent history. Here are some of our favourite pictures.
1
Cable, Osborne and Balls, 2016
Stefan Rousseau/PA Wire
2
Heseltine, Blair and Clarke, 2001
Stefan Rousseau/PA Archive
3
Farron, Cameron and Harman, 2016
WPA Pool via Getty Images
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4
Major, Blair and Brown, 2012
Stefan Rousseau/PA Archive
5
Khan and Cameron, 2016
Yui Mok/PA Archive
6
Davidson, Sturgeon and Dugdale, 2016
Andrew Milligan/PA Wire
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7
Ashdown, Cameron and Kinnock, 2016
Stefan Rousseau/PA Wire
8
Wood, Sturgeon and Farage, 2015
Stefan Rousseau/PA Archive
9
Miliband, Clegg and Cameron, 2014
LEFTERIS PITARAKIS via Getty Images
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10
Cameron, Osborne and Harman, 2015
Dan Kitwood via Getty Images
11
Brown, Cameron and Clegg, 2010
Handout via Getty Images
12
Major, Ashdown and Blair, 1995
ASSOCIATED PRESS
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