Labour's candidate - and the clear favourite to be the next MP for this constituency - Stephen Doughty was given a warm round of applause by a group of party members as he arrived at the count a few minutes ago.
Stephen Doughty will be the new MP. He's increased Labour's majority slightly, but turnout was just 25%.
Counting begins to find out who voters in Wales' biggest constituency by population have chosen as their new MP.
It's the final day of campaigning before the Cardiff South and Penarth by-election.