The Labour Party greatly increased its vote share and surpassed the total votes of either Liberal party. Labour became the Official Opposition for the first time, but they lacked an official leader and so the Leader of the Opposition for the next fourteen months was the stand-in Liberal leader Donald Maclean (Asquith, having lost his seat at this election, was not returned until a by-election in February 1920). Labour could only slightly increase their number of seats, however, from 42 to 57 and some of their earlier leaders including Ramsay MacDonald and Arthur Henderson lost their seats. Labour won the most seats in Wales (which had previously been dominated by the Liberals) for the first time, a feat it has continued to the present day.