South Yorkshire MP Caroline Flint has stood down from her role as shadow energy and climate change secretary after Jeremy Corbyn became the new Labour leader.
The MP for Don Valley - who also was a candidate in the deputy leader race - confirmed she would be going back to the backbenches in the House of Commons after key shadow cabinet appointments had been made by Mr Corbyn.
Sheffield Penistone and Stocksbridge MP Angela Smith, former shadow food and farming minister, has also said she would not accept a role on his front bench.
Several former frontbenchers have stood down since Mr Corbyn’s election.
Ms Flint, who lost out to Tom Watson in the deputy leadership bid, said: “I have greatly enjoyed campaigning for the last four years for fair energy bills, to end the scandal of cold homes and for decisive action on climate change, so this was a hard decision to make.
“Returning to the backbenches will also allow me to spend more time helping Labour reach out to those voters who turned away from us, but who share many of our values.
“I hope this work will be helpful to Jeremy, the shadow cabinet and the Labour Party as we rebuild over the next five years.”
Rosie Winterton, the MP for Doncaster Central, remains Labour’s chief whip and Rotherham MP John Healey has now been confirmed as Mr Corbyn’s shadow minister for housing and planning.
He was the housing minister when Labour was in power.
Mr Healey said: “Housing has long been a passion of Jeremy’s, so I’m pleased to have his backing to do this job at full shadow cabinet level. It shows the high political priority he gives to tackling the housing crisis.
“Families across the country desperately need a Government that will step up to the plate on housing, but this Conservative government has stepped back.
“As a Labour opposition it’s our urgent task to expose the way this government is letting people down, and to show the big difference a Labour government could make.”
Mr Corbyn, who spoke to large crowds in Sheffield as part of his leadership campaign, was elected as the new party leader on Saturday in a landslide victory.
He replaces Doncaster North MP Ed Miliband, who stood down as leader after the Conservatives won the general election in May.