Janet Daby has become Labour’s newest MP after winning the Lewisham East by-election.

Only a third of eligible voters cast their ballot as Ms Daby held the seat with a majority of 5,629, well below the 21,213 Heidi Alexander achieved at the 2017 general election when turnout was 69%.

The Liberal Democrats leapfrogged the Conservatives to take second place in a seat which voted heavily for Remain in the European Union referendum.

Ms Daby said the result showed “we will not tolerate an extreme Brexit in Lewisham East”.

Lewisham East by-election
Ballot papers being counted during the Lewisham East by-election (Yui Mok/PA)

Ms Daby picked up 11,033 votes – a 50.2% share, down nearly 18 percentage points from Ms Alexander’s vote share in 2017.

Lib Dem Lucy Salek had 5,404 votes, a 24.59% share, while the Conservative Ross Archer had 3,161 votes, a 14.38% share.

Ms Daby said: “We refuse to stand by and let a Tory government devastate our schools, our health service and our housing.”

The result put the Lib Dems up more than 20 percentage points, with a swing of nearly 19% from Labour to Lib Dem.