Boris Johnson did not put a cross next to his own name on polling day after registering to vote in Westminster, rather than Uxbridge and South Ruislip.
The prime minister and dog Dilyn took a short walk from Downing Street to a polling station in central London, where he cast his vote in the Cities of London and Westminster constituency.
Mr Johnson is defending a 5,034 majority in his west London seat, the smallest of any prime minister since 1924, and has faced a determined challenge from Labour candidate Ali Milani.
Recent prime ministers have all spent Election Day in their constituencies, with Theresa May voting in Maidenhead two years ago and David Cameron and family visiting a polling station in Witney in 2015.
However, Gordon Brown voted in North Queensferry in 2010, situated in the Dunfermline and West Fife constituency where he had his family home and neighbouring his his own seat of Kirkcaldy and Cowdenbeath.
Tony Blair always voted in his constituency of Sedgefield in County Durham, even after his family had lived in Downing Street for eight years.
With dogs at polling stations trending on social media, Mr Johnson took a short stroll with his Jack Russell-cross, a puppy he rescued from an animal charity in south Wales in September but there was no sign of his girlfriend Carrie Symonds.
Jeremy Corbyn voted with wife Laura Alvarez in Islington North, where he lives and has represented as an MP since 1983.
However, a woman dressed as Elmo, a character from children’s TV programme Sesame Street, was restrained by security guards as she tried to approach the Labour leader as he walked into the polling station.
Liberal Democrat leader Jo Swinson voted in Glasgow with her husband John Hames, she is defending a 5,339 majority in East Dunbartonshire.